Unicode range supported in variables

Review the valid characters that can be used in a variable name.


Language	Characters	Range
Arabic		U+0600 - U+0605, U+0620 - U+0669, U+066E - U+06D3
CJK ideographs	Common	U+4E00 - U+9FEA
	Extension A	U+3400 - U+4DB5
	CJK compatibility ideographs	U+F900 - U+FA6D
Chinese	Chinese Kanji	See CJK ideographs
Greek	All alphabetical characters (uppercase and lowercase) are supported. For extended characters ( ά έ ή ί ϊ ΐ ό ύ ϋ ΰ ώ €)	U+0370 - U+0374, U+0376 - U+0377, U+037A - U+037D, U+037F - U+0386, U+0388 - U+038A, U+038C, U+038E - U+03A1, U+03A3 - U+03F5, U+03F7 - U+03FF, U+1F00 - U+1F15, U+1F18 - U+1F1D, U+1F20 - U+1F45, U+1F48 - U+1F4D, U+1F50 - U+1F57, U+1F59, U+1F5B, U+1F5D, U+1F5F - U+1F7D, U+1F80 - U+1FB4, U+1FB6 - U+1FBC, U+1FBE, U+1FC2 - U+1FC4, U+1FC6 - U+1FCC, U+1FD0 - U+1FD3, U+1FD6 - U+1FDB, U+1FE0 - U+1FEC, U+1FF2 - U+1FF4, U+1FF6 - U+1FFC
Japanese	Hiragana	U+3041 - U+3096, U+309D, U+309E
	Katakana full-width and half-width characters	U+30A1 - U+30FA, U+30FC
	Kanji	See CJK ideographs
	Double-byte numbers	U+FF10 - U+FF19
Korean	Hangul Syllables	U+AC00 - U+D7A3
Latin	a-z A-Z	U+0061 - U+007A U+0041 - U+005A
Latin extended (Czech, Danish, Dutch, Finnish, French, German, Hungarian, Italian, Norwegian, Polish, Portuguese, Romanian, Spanish, and Swedish)	Latin-1 supplement	U+00C0 - U+00D6, U+00D8 - U+00F6, U+00F8 - U+00FF
	Latin Extended-A	U+0100 - U+017F
	Latin Extended-B	U+0180 - U+024F
	Latin Extended-C	U+2C60 - U+2C7F
	Currency symbols	U+20AC
Numbers	0-9	U+0030 - U+0039
Russian	Cyrillic	U+0400 - U+0481, U+0483 - U+0487, U+048A - U+04FF
Special characters	Hyphen (-) and underscore (_)	U+002D, U+005F

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