79 characters in the Modi Unicode block.
U+11600MODI LETTER AU+11601MODI LETTER AAU+11602MODI LETTER IU+11603MODI LETTER IIU+11604MODI LETTER UU+11605MODI LETTER UUU+11606MODI LETTER VOCALIC RU+11607MODI LETTER VOCALIC RRU+11608MODI LETTER VOCALIC LU+11609MODI LETTER VOCALIC LLU+1160AMODI LETTER EU+1160BMODI LETTER AIU+1160CMODI LETTER OU+1160DMODI LETTER AUU+1160EMODI LETTER KAU+1160FMODI LETTER KHAU+11610MODI LETTER GAU+11611MODI LETTER GHAU+11612MODI LETTER NGAU+11613MODI LETTER CAU+11614MODI LETTER CHAU+11615MODI LETTER JAU+11616MODI LETTER JHAU+11617MODI LETTER NYAU+11618MODI LETTER TTAU+11619MODI LETTER TTHAU+1161AMODI LETTER DDAU+1161BMODI LETTER DDHAU+1161CMODI LETTER NNAU+1161DMODI LETTER TAU+1161EMODI LETTER THAU+1161FMODI LETTER DAU+11620MODI LETTER DHAU+11621MODI LETTER NAU+11622MODI LETTER PAU+11623MODI LETTER PHAU+11624MODI LETTER BAU+11625MODI LETTER BHAU+11626MODI LETTER MAU+11627MODI LETTER YAU+11628MODI LETTER RAU+11629MODI LETTER LAU+1162AMODI LETTER VAU+1162BMODI LETTER SHAU+1162CMODI LETTER SSAU+1162DMODI LETTER SAU+1162EMODI LETTER HAU+1162FMODI LETTER LLAU+11630MODI VOWEL SIGN AAU+11631MODI VOWEL SIGN IU+11632MODI VOWEL SIGN IIU+11633MODI VOWEL SIGN UU+11634MODI VOWEL SIGN UUU+11635MODI VOWEL SIGN VOCALIC RU+11636MODI VOWEL SIGN VOCALIC RRU+11637MODI VOWEL SIGN VOCALIC LU+11638MODI VOWEL SIGN VOCALIC LLU+11639MODI VOWEL SIGN EU+1163AMODI VOWEL SIGN AIU+1163BMODI VOWEL SIGN OU+1163CMODI VOWEL SIGN AUU+1163DMODI SIGN ANUSVARAU+1163EMODI SIGN VISARGAU+1163FMODI SIGN VIRAMAU+11640MODI SIGN ARDHACANDRAU+11641MODI DANDAU+11642MODI DOUBLE DANDAU+11643MODI ABBREVIATION SIGNU+11644MODI SIGN HUVAU+11650MODI DIGIT ZEROU+11651MODI DIGIT ONEU+11652MODI DIGIT TWOU+11653MODI DIGIT THREEU+11654MODI DIGIT FOURU+11655MODI DIGIT FIVEU+11656MODI DIGIT SIXU+11657MODI DIGIT SEVENU+11658MODI DIGIT EIGHTU+11659MODI DIGIT NINE