diff --git a/Lib/fontTools/unicodedata/__init__.py b/Lib/fontTools/unicodedata/__init__.py
index 4c6e346aa..7428b5416 100644
--- a/Lib/fontTools/unicodedata/__init__.py
+++ b/Lib/fontTools/unicodedata/__init__.py
@@ -39,15 +39,15 @@ __all__ = [
 
 
 def script(char):
-    """ Return the script property assigned to the Unicode character 'char'
-    as string.
+    """ Return the four-letter script code assigned to the Unicode character
+    'char' as string.
 
     >>> script("a")
-    'Latin'
+    'Latn'
     >>> script(",")
-    'Common'
+    'Zyyy'
     >>> script(unichr(0x10FFFF))
-    'Unknown'
+    'Zzzz'
     """
     code = byteord(char)
     # 'bisect_right(a, x, lo=0, hi=len(a))' returns an insertion point which
@@ -67,11 +67,11 @@ def script_extension(char):
     """ Return the script extension property assigned to the Unicode character
     'char' as a set of string.
 
-    >>> script_extension("a") == {'Latin'}
+    >>> script_extension("a") == {'Latn'}
     True
     >>> script_extension(unichr(0x060C)) == {'Arab', 'Syrc', 'Thaa'}
     True
-    >>> script_extension(unichr(0x10FFFF)) == {'Unknown'}
+    >>> script_extension(unichr(0x10FFFF)) == {'Zzzz'}
     True
     """
     code = byteord(char)
diff --git a/Tests/unicodedata_test.py b/Tests/unicodedata_test.py
index 8c42f3196..ba9a3c448 100644
--- a/Tests/unicodedata_test.py
+++ b/Tests/unicodedata_test.py
@@ -6,160 +6,160 @@ from fontTools import unicodedata
 
 
 def test_script():
-    assert unicodedata.script("a") == "Latin"
-    assert unicodedata.script(unichr(0)) == "Common"
-    assert unicodedata.script(unichr(0x0378)) == "Unknown"
-    assert unicodedata.script(unichr(0x10FFFF)) == "Unknown"
+    assert unicodedata.script("a") == "Latn"
+    assert unicodedata.script(unichr(0)) == "Zyyy"
+    assert unicodedata.script(unichr(0x0378)) == "Zzzz"
+    assert unicodedata.script(unichr(0x10FFFF)) == "Zzzz"
 
     # these were randomly sampled, one character per script
-    assert unicodedata.script(unichr(0x1E918)) == 'Adlam'
+    assert unicodedata.script(unichr(0x1E918)) == 'Adlm'
     assert unicodedata.script(unichr(0x1170D)) == 'Ahom'
-    assert unicodedata.script(unichr(0x145A0)) == 'Anatolian_Hieroglyphs'
-    assert unicodedata.script(unichr(0x0607)) == 'Arabic'
-    assert unicodedata.script(unichr(0x056C)) == 'Armenian'
-    assert unicodedata.script(unichr(0x10B27)) == 'Avestan'
-    assert unicodedata.script(unichr(0x1B41)) == 'Balinese'
-    assert unicodedata.script(unichr(0x168AD)) == 'Bamum'
-    assert unicodedata.script(unichr(0x16ADD)) == 'Bassa_Vah'
-    assert unicodedata.script(unichr(0x1BE5)) == 'Batak'
-    assert unicodedata.script(unichr(0x09F3)) == 'Bengali'
-    assert unicodedata.script(unichr(0x11C5B)) == 'Bhaiksuki'
-    assert unicodedata.script(unichr(0x3126)) == 'Bopomofo'
-    assert unicodedata.script(unichr(0x1103B)) == 'Brahmi'
-    assert unicodedata.script(unichr(0x2849)) == 'Braille'
-    assert unicodedata.script(unichr(0x1A0A)) == 'Buginese'
-    assert unicodedata.script(unichr(0x174E)) == 'Buhid'
-    assert unicodedata.script(unichr(0x18EE)) == 'Canadian_Aboriginal'
-    assert unicodedata.script(unichr(0x102B7)) == 'Carian'
-    assert unicodedata.script(unichr(0x1053D)) == 'Caucasian_Albanian'
-    assert unicodedata.script(unichr(0x11123)) == 'Chakma'
+    assert unicodedata.script(unichr(0x145A0)) == 'Hluw'
+    assert unicodedata.script(unichr(0x0607)) == 'Arab'
+    assert unicodedata.script(unichr(0x056C)) == 'Armn'
+    assert unicodedata.script(unichr(0x10B27)) == 'Avst'
+    assert unicodedata.script(unichr(0x1B41)) == 'Bali'
+    assert unicodedata.script(unichr(0x168AD)) == 'Bamu'
+    assert unicodedata.script(unichr(0x16ADD)) == 'Bass'
+    assert unicodedata.script(unichr(0x1BE5)) == 'Batk'
+    assert unicodedata.script(unichr(0x09F3)) == 'Beng'
+    assert unicodedata.script(unichr(0x11C5B)) == 'Bhks'
+    assert unicodedata.script(unichr(0x3126)) == 'Bopo'
+    assert unicodedata.script(unichr(0x1103B)) == 'Brah'
+    assert unicodedata.script(unichr(0x2849)) == 'Brai'
+    assert unicodedata.script(unichr(0x1A0A)) == 'Bugi'
+    assert unicodedata.script(unichr(0x174E)) == 'Buhd'
+    assert unicodedata.script(unichr(0x18EE)) == 'Cans'
+    assert unicodedata.script(unichr(0x102B7)) == 'Cari'
+    assert unicodedata.script(unichr(0x1053D)) == 'Aghb'
+    assert unicodedata.script(unichr(0x11123)) == 'Cakm'
     assert unicodedata.script(unichr(0xAA1F)) == 'Cham'
-    assert unicodedata.script(unichr(0xAB95)) == 'Cherokee'
-    assert unicodedata.script(unichr(0x1F0C7)) == 'Common'
-    assert unicodedata.script(unichr(0x2C85)) == 'Coptic'
-    assert unicodedata.script(unichr(0x12014)) == 'Cuneiform'
-    assert unicodedata.script(unichr(0x1082E)) == 'Cypriot'
-    assert unicodedata.script(unichr(0xA686)) == 'Cyrillic'
-    assert unicodedata.script(unichr(0x10417)) == 'Deseret'
-    assert unicodedata.script(unichr(0x093E)) == 'Devanagari'
-    assert unicodedata.script(unichr(0x1BC4B)) == 'Duployan'
-    assert unicodedata.script(unichr(0x1310C)) == 'Egyptian_Hieroglyphs'
-    assert unicodedata.script(unichr(0x1051C)) == 'Elbasan'
-    assert unicodedata.script(unichr(0x2DA6)) == 'Ethiopic'
-    assert unicodedata.script(unichr(0x10AD)) == 'Georgian'
-    assert unicodedata.script(unichr(0x2C52)) == 'Glagolitic'
-    assert unicodedata.script(unichr(0x10343)) == 'Gothic'
-    assert unicodedata.script(unichr(0x11371)) == 'Grantha'
-    assert unicodedata.script(unichr(0x03D0)) == 'Greek'
-    assert unicodedata.script(unichr(0x0AAA)) == 'Gujarati'
-    assert unicodedata.script(unichr(0x0A4C)) == 'Gurmukhi'
-    assert unicodedata.script(unichr(0x23C9F)) == 'Han'
-    assert unicodedata.script(unichr(0xC259)) == 'Hangul'
-    assert unicodedata.script(unichr(0x1722)) == 'Hanunoo'
-    assert unicodedata.script(unichr(0x108F5)) == 'Hatran'
-    assert unicodedata.script(unichr(0x05C2)) == 'Hebrew'
-    assert unicodedata.script(unichr(0x1B072)) == 'Hiragana'
-    assert unicodedata.script(unichr(0x10847)) == 'Imperial_Aramaic'
-    assert unicodedata.script(unichr(0x033A)) == 'Inherited'
-    assert unicodedata.script(unichr(0x10B66)) == 'Inscriptional_Pahlavi'
-    assert unicodedata.script(unichr(0x10B4B)) == 'Inscriptional_Parthian'
-    assert unicodedata.script(unichr(0xA98A)) == 'Javanese'
-    assert unicodedata.script(unichr(0x110B2)) == 'Kaithi'
-    assert unicodedata.script(unichr(0x0CC6)) == 'Kannada'
-    assert unicodedata.script(unichr(0x3337)) == 'Katakana'
-    assert unicodedata.script(unichr(0xA915)) == 'Kayah_Li'
-    assert unicodedata.script(unichr(0x10A2E)) == 'Kharoshthi'
-    assert unicodedata.script(unichr(0x17AA)) == 'Khmer'
-    assert unicodedata.script(unichr(0x11225)) == 'Khojki'
-    assert unicodedata.script(unichr(0x112B6)) == 'Khudawadi'
-    assert unicodedata.script(unichr(0x0ED7)) == 'Lao'
-    assert unicodedata.script(unichr(0xAB3C)) == 'Latin'
-    assert unicodedata.script(unichr(0x1C48)) == 'Lepcha'
-    assert unicodedata.script(unichr(0x1923)) == 'Limbu'
-    assert unicodedata.script(unichr(0x1071D)) == 'Linear_A'
-    assert unicodedata.script(unichr(0x100EC)) == 'Linear_B'
+    assert unicodedata.script(unichr(0xAB95)) == 'Cher'
+    assert unicodedata.script(unichr(0x1F0C7)) == 'Zyyy'
+    assert unicodedata.script(unichr(0x2C85)) == 'Copt'
+    assert unicodedata.script(unichr(0x12014)) == 'Xsux'
+    assert unicodedata.script(unichr(0x1082E)) == 'Cprt'
+    assert unicodedata.script(unichr(0xA686)) == 'Cyrl'
+    assert unicodedata.script(unichr(0x10417)) == 'Dsrt'
+    assert unicodedata.script(unichr(0x093E)) == 'Deva'
+    assert unicodedata.script(unichr(0x1BC4B)) == 'Dupl'
+    assert unicodedata.script(unichr(0x1310C)) == 'Egyp'
+    assert unicodedata.script(unichr(0x1051C)) == 'Elba'
+    assert unicodedata.script(unichr(0x2DA6)) == 'Ethi'
+    assert unicodedata.script(unichr(0x10AD)) == 'Geor'
+    assert unicodedata.script(unichr(0x2C52)) == 'Glag'
+    assert unicodedata.script(unichr(0x10343)) == 'Goth'
+    assert unicodedata.script(unichr(0x11371)) == 'Gran'
+    assert unicodedata.script(unichr(0x03D0)) == 'Grek'
+    assert unicodedata.script(unichr(0x0AAA)) == 'Gujr'
+    assert unicodedata.script(unichr(0x0A4C)) == 'Guru'
+    assert unicodedata.script(unichr(0x23C9F)) == 'Hani'
+    assert unicodedata.script(unichr(0xC259)) == 'Hang'
+    assert unicodedata.script(unichr(0x1722)) == 'Hano'
+    assert unicodedata.script(unichr(0x108F5)) == 'Hatr'
+    assert unicodedata.script(unichr(0x05C2)) == 'Hebr'
+    assert unicodedata.script(unichr(0x1B072)) == 'Hira'
+    assert unicodedata.script(unichr(0x10847)) == 'Armi'
+    assert unicodedata.script(unichr(0x033A)) == 'Zinh'
+    assert unicodedata.script(unichr(0x10B66)) == 'Phli'
+    assert unicodedata.script(unichr(0x10B4B)) == 'Prti'
+    assert unicodedata.script(unichr(0xA98A)) == 'Java'
+    assert unicodedata.script(unichr(0x110B2)) == 'Kthi'
+    assert unicodedata.script(unichr(0x0CC6)) == 'Knda'
+    assert unicodedata.script(unichr(0x3337)) == 'Kana'
+    assert unicodedata.script(unichr(0xA915)) == 'Kali'
+    assert unicodedata.script(unichr(0x10A2E)) == 'Khar'
+    assert unicodedata.script(unichr(0x17AA)) == 'Khmr'
+    assert unicodedata.script(unichr(0x11225)) == 'Khoj'
+    assert unicodedata.script(unichr(0x112B6)) == 'Sind'
+    assert unicodedata.script(unichr(0x0ED7)) == 'Laoo'
+    assert unicodedata.script(unichr(0xAB3C)) == 'Latn'
+    assert unicodedata.script(unichr(0x1C48)) == 'Lepc'
+    assert unicodedata.script(unichr(0x1923)) == 'Limb'
+    assert unicodedata.script(unichr(0x1071D)) == 'Lina'
+    assert unicodedata.script(unichr(0x100EC)) == 'Linb'
     assert unicodedata.script(unichr(0xA4E9)) == 'Lisu'
-    assert unicodedata.script(unichr(0x10284)) == 'Lycian'
-    assert unicodedata.script(unichr(0x10926)) == 'Lydian'
-    assert unicodedata.script(unichr(0x11161)) == 'Mahajani'
-    assert unicodedata.script(unichr(0x0D56)) == 'Malayalam'
-    assert unicodedata.script(unichr(0x0856)) == 'Mandaic'
-    assert unicodedata.script(unichr(0x10AF0)) == 'Manichaean'
-    assert unicodedata.script(unichr(0x11CB0)) == 'Marchen'
-    assert unicodedata.script(unichr(0x11D28)) == 'Masaram_Gondi'
-    assert unicodedata.script(unichr(0xABDD)) == 'Meetei_Mayek'
-    assert unicodedata.script(unichr(0x1E897)) == 'Mende_Kikakui'
-    assert unicodedata.script(unichr(0x109B0)) == 'Meroitic_Cursive'
-    assert unicodedata.script(unichr(0x10993)) == 'Meroitic_Hieroglyphs'
-    assert unicodedata.script(unichr(0x16F5D)) == 'Miao'
+    assert unicodedata.script(unichr(0x10284)) == 'Lyci'
+    assert unicodedata.script(unichr(0x10926)) == 'Lydi'
+    assert unicodedata.script(unichr(0x11161)) == 'Mahj'
+    assert unicodedata.script(unichr(0x0D56)) == 'Mlym'
+    assert unicodedata.script(unichr(0x0856)) == 'Mand'
+    assert unicodedata.script(unichr(0x10AF0)) == 'Mani'
+    assert unicodedata.script(unichr(0x11CB0)) == 'Marc'
+    assert unicodedata.script(unichr(0x11D28)) == 'Gonm'
+    assert unicodedata.script(unichr(0xABDD)) == 'Mtei'
+    assert unicodedata.script(unichr(0x1E897)) == 'Mend'
+    assert unicodedata.script(unichr(0x109B0)) == 'Merc'
+    assert unicodedata.script(unichr(0x10993)) == 'Mero'
+    assert unicodedata.script(unichr(0x16F5D)) == 'Plrd'
     assert unicodedata.script(unichr(0x1160B)) == 'Modi'
-    assert unicodedata.script(unichr(0x18A8)) == 'Mongolian'
-    assert unicodedata.script(unichr(0x16A48)) == 'Mro'
-    assert unicodedata.script(unichr(0x1128C)) == 'Multani'
-    assert unicodedata.script(unichr(0x105B)) == 'Myanmar'
-    assert unicodedata.script(unichr(0x108AF)) == 'Nabataean'
-    assert unicodedata.script(unichr(0x19B3)) == 'New_Tai_Lue'
+    assert unicodedata.script(unichr(0x18A8)) == 'Mong'
+    assert unicodedata.script(unichr(0x16A48)) == 'Mroo'
+    assert unicodedata.script(unichr(0x1128C)) == 'Mult'
+    assert unicodedata.script(unichr(0x105B)) == 'Mymr'
+    assert unicodedata.script(unichr(0x108AF)) == 'Nbat'
+    assert unicodedata.script(unichr(0x19B3)) == 'Talu'
     assert unicodedata.script(unichr(0x1143D)) == 'Newa'
-    assert unicodedata.script(unichr(0x07F4)) == 'Nko'
-    assert unicodedata.script(unichr(0x1B192)) == 'Nushu'
-    assert unicodedata.script(unichr(0x169C)) == 'Ogham'
-    assert unicodedata.script(unichr(0x1C56)) == 'Ol_Chiki'
-    assert unicodedata.script(unichr(0x10CE9)) == 'Old_Hungarian'
-    assert unicodedata.script(unichr(0x10316)) == 'Old_Italic'
-    assert unicodedata.script(unichr(0x10A93)) == 'Old_North_Arabian'
-    assert unicodedata.script(unichr(0x1035A)) == 'Old_Permic'
-    assert unicodedata.script(unichr(0x103D5)) == 'Old_Persian'
-    assert unicodedata.script(unichr(0x10A65)) == 'Old_South_Arabian'
-    assert unicodedata.script(unichr(0x10C09)) == 'Old_Turkic'
-    assert unicodedata.script(unichr(0x0B60)) == 'Oriya'
-    assert unicodedata.script(unichr(0x104CF)) == 'Osage'
-    assert unicodedata.script(unichr(0x104A8)) == 'Osmanya'
-    assert unicodedata.script(unichr(0x16B12)) == 'Pahawh_Hmong'
-    assert unicodedata.script(unichr(0x10879)) == 'Palmyrene'
-    assert unicodedata.script(unichr(0x11AF1)) == 'Pau_Cin_Hau'
-    assert unicodedata.script(unichr(0xA869)) == 'Phags_Pa'
-    assert unicodedata.script(unichr(0x10909)) == 'Phoenician'
-    assert unicodedata.script(unichr(0x10B81)) == 'Psalter_Pahlavi'
-    assert unicodedata.script(unichr(0xA941)) == 'Rejang'
-    assert unicodedata.script(unichr(0x16C3)) == 'Runic'
-    assert unicodedata.script(unichr(0x0814)) == 'Samaritan'
-    assert unicodedata.script(unichr(0xA88C)) == 'Saurashtra'
-    assert unicodedata.script(unichr(0x111C8)) == 'Sharada'
-    assert unicodedata.script(unichr(0x1045F)) == 'Shavian'
-    assert unicodedata.script(unichr(0x115AD)) == 'Siddham'
-    assert unicodedata.script(unichr(0x1D8C0)) == 'SignWriting'
-    assert unicodedata.script(unichr(0x0DB9)) == 'Sinhala'
-    assert unicodedata.script(unichr(0x110F9)) == 'Sora_Sompeng'
-    assert unicodedata.script(unichr(0x11A60)) == 'Soyombo'
-    assert unicodedata.script(unichr(0x1B94)) == 'Sundanese'
-    assert unicodedata.script(unichr(0xA81F)) == 'Syloti_Nagri'
-    assert unicodedata.script(unichr(0x0740)) == 'Syriac'
-    assert unicodedata.script(unichr(0x1714)) == 'Tagalog'
-    assert unicodedata.script(unichr(0x1761)) == 'Tagbanwa'
-    assert unicodedata.script(unichr(0x1965)) == 'Tai_Le'
-    assert unicodedata.script(unichr(0x1A32)) == 'Tai_Tham'
-    assert unicodedata.script(unichr(0xAA86)) == 'Tai_Viet'
-    assert unicodedata.script(unichr(0x116A5)) == 'Takri'
-    assert unicodedata.script(unichr(0x0B8E)) == 'Tamil'
-    assert unicodedata.script(unichr(0x1754D)) == 'Tangut'
-    assert unicodedata.script(unichr(0x0C40)) == 'Telugu'
-    assert unicodedata.script(unichr(0x07A4)) == 'Thaana'
+    assert unicodedata.script(unichr(0x07F4)) == 'Nkoo'
+    assert unicodedata.script(unichr(0x1B192)) == 'Nshu'
+    assert unicodedata.script(unichr(0x169C)) == 'Ogam'
+    assert unicodedata.script(unichr(0x1C56)) == 'Olck'
+    assert unicodedata.script(unichr(0x10CE9)) == 'Hung'
+    assert unicodedata.script(unichr(0x10316)) == 'Ital'
+    assert unicodedata.script(unichr(0x10A93)) == 'Narb'
+    assert unicodedata.script(unichr(0x1035A)) == 'Perm'
+    assert unicodedata.script(unichr(0x103D5)) == 'Xpeo'
+    assert unicodedata.script(unichr(0x10A65)) == 'Sarb'
+    assert unicodedata.script(unichr(0x10C09)) == 'Orkh'
+    assert unicodedata.script(unichr(0x0B60)) == 'Orya'
+    assert unicodedata.script(unichr(0x104CF)) == 'Osge'
+    assert unicodedata.script(unichr(0x104A8)) == 'Osma'
+    assert unicodedata.script(unichr(0x16B12)) == 'Hmng'
+    assert unicodedata.script(unichr(0x10879)) == 'Palm'
+    assert unicodedata.script(unichr(0x11AF1)) == 'Pauc'
+    assert unicodedata.script(unichr(0xA869)) == 'Phag'
+    assert unicodedata.script(unichr(0x10909)) == 'Phnx'
+    assert unicodedata.script(unichr(0x10B81)) == 'Phlp'
+    assert unicodedata.script(unichr(0xA941)) == 'Rjng'
+    assert unicodedata.script(unichr(0x16C3)) == 'Runr'
+    assert unicodedata.script(unichr(0x0814)) == 'Samr'
+    assert unicodedata.script(unichr(0xA88C)) == 'Saur'
+    assert unicodedata.script(unichr(0x111C8)) == 'Shrd'
+    assert unicodedata.script(unichr(0x1045F)) == 'Shaw'
+    assert unicodedata.script(unichr(0x115AD)) == 'Sidd'
+    assert unicodedata.script(unichr(0x1D8C0)) == 'Sgnw'
+    assert unicodedata.script(unichr(0x0DB9)) == 'Sinh'
+    assert unicodedata.script(unichr(0x110F9)) == 'Sora'
+    assert unicodedata.script(unichr(0x11A60)) == 'Soyo'
+    assert unicodedata.script(unichr(0x1B94)) == 'Sund'
+    assert unicodedata.script(unichr(0xA81F)) == 'Sylo'
+    assert unicodedata.script(unichr(0x0740)) == 'Syrc'
+    assert unicodedata.script(unichr(0x1714)) == 'Tglg'
+    assert unicodedata.script(unichr(0x1761)) == 'Tagb'
+    assert unicodedata.script(unichr(0x1965)) == 'Tale'
+    assert unicodedata.script(unichr(0x1A32)) == 'Lana'
+    assert unicodedata.script(unichr(0xAA86)) == 'Tavt'
+    assert unicodedata.script(unichr(0x116A5)) == 'Takr'
+    assert unicodedata.script(unichr(0x0B8E)) == 'Taml'
+    assert unicodedata.script(unichr(0x1754D)) == 'Tang'
+    assert unicodedata.script(unichr(0x0C40)) == 'Telu'
+    assert unicodedata.script(unichr(0x07A4)) == 'Thaa'
     assert unicodedata.script(unichr(0x0E42)) == 'Thai'
-    assert unicodedata.script(unichr(0x0F09)) == 'Tibetan'
-    assert unicodedata.script(unichr(0x2D3A)) == 'Tifinagh'
-    assert unicodedata.script(unichr(0x114B0)) == 'Tirhuta'
-    assert unicodedata.script(unichr(0x1038B)) == 'Ugaritic'
-    assert unicodedata.script(unichr(0xA585)) == 'Vai'
-    assert unicodedata.script(unichr(0x118CF)) == 'Warang_Citi'
-    assert unicodedata.script(unichr(0xA066)) == 'Yi'
-    assert unicodedata.script(unichr(0x11A31)) == 'Zanabazar_Square'
+    assert unicodedata.script(unichr(0x0F09)) == 'Tibt'
+    assert unicodedata.script(unichr(0x2D3A)) == 'Tfng'
+    assert unicodedata.script(unichr(0x114B0)) == 'Tirh'
+    assert unicodedata.script(unichr(0x1038B)) == 'Ugar'
+    assert unicodedata.script(unichr(0xA585)) == 'Vaii'
+    assert unicodedata.script(unichr(0x118CF)) == 'Wara'
+    assert unicodedata.script(unichr(0xA066)) == 'Yiii'
+    assert unicodedata.script(unichr(0x11A31)) == 'Zanb'
 
 
 def test_script_extension():
-    assert unicodedata.script_extension("a") == {"Latin"}
-    assert unicodedata.script_extension(unichr(0)) == {"Common"}
-    assert unicodedata.script_extension(unichr(0x0378)) == {"Unknown"}
-    assert unicodedata.script_extension(unichr(0x10FFFF)) == {"Unknown"}
+    assert unicodedata.script_extension("a") == {"Latn"}
+    assert unicodedata.script_extension(unichr(0)) == {"Zyyy"}
+    assert unicodedata.script_extension(unichr(0x0378)) == {"Zzzz"}
+    assert unicodedata.script_extension(unichr(0x10FFFF)) == {"Zzzz"}
 
     assert unicodedata.script_extension("\u0660") == {'Arab', 'Thaa'}
     assert unicodedata.script_extension("\u0964") == {