72 characters in the Tamil Unicode block.
U+0B82TAMIL SIGN ANUSVARAU+0B83TAMIL SIGN VISARGAU+0B85TAMIL LETTER AU+0B86TAMIL LETTER AAU+0B87TAMIL LETTER IU+0B88TAMIL LETTER IIU+0B89TAMIL LETTER UU+0B8ATAMIL LETTER UUU+0B8ETAMIL LETTER EU+0B8FTAMIL LETTER EEU+0B90TAMIL LETTER AIU+0B92TAMIL LETTER OU+0B93TAMIL LETTER OOU+0B94TAMIL LETTER AUU+0B95TAMIL LETTER KAU+0B99TAMIL LETTER NGAU+0B9ATAMIL LETTER CAU+0B9CTAMIL LETTER JAU+0B9ETAMIL LETTER NYAU+0B9FTAMIL LETTER TTAU+0BA3TAMIL LETTER NNAU+0BA4TAMIL LETTER TAU+0BA8TAMIL LETTER NAU+0BA9TAMIL LETTER NNNAU+0BAATAMIL LETTER PAU+0BAETAMIL LETTER MAU+0BAFTAMIL LETTER YAU+0BB0TAMIL LETTER RAU+0BB1TAMIL LETTER RRAU+0BB2TAMIL LETTER LAU+0BB3TAMIL LETTER LLAU+0BB4TAMIL LETTER LLLAU+0BB5TAMIL LETTER VAU+0BB6TAMIL LETTER SHAU+0BB7TAMIL LETTER SSAU+0BB8TAMIL LETTER SAU+0BB9TAMIL LETTER HAU+0BBETAMIL VOWEL SIGN AAU+0BBFTAMIL VOWEL SIGN IU+0BC0TAMIL VOWEL SIGN IIU+0BC1TAMIL VOWEL SIGN UU+0BC2TAMIL VOWEL SIGN UUU+0BC6TAMIL VOWEL SIGN EU+0BC7TAMIL VOWEL SIGN EEU+0BC8TAMIL VOWEL SIGN AIU+0BCATAMIL VOWEL SIGN OU+0BCBTAMIL VOWEL SIGN OOU+0BCCTAMIL VOWEL SIGN AUU+0BCDTAMIL SIGN VIRAMAU+0BD0TAMIL OMU+0BD7TAMIL AU LENGTH MARKU+0BE6TAMIL DIGIT ZEROU+0BE7TAMIL DIGIT ONEU+0BE8TAMIL DIGIT TWOU+0BE9TAMIL DIGIT THREEU+0BEATAMIL DIGIT FOURU+0BEBTAMIL DIGIT FIVEU+0BECTAMIL DIGIT SIXU+0BEDTAMIL DIGIT SEVENU+0BEETAMIL DIGIT EIGHTU+0BEFTAMIL DIGIT NINEU+0BF0TAMIL NUMBER TENU+0BF1TAMIL NUMBER ONE HUNDREDU+0BF2TAMIL NUMBER ONE THOUSANDU+0BF3TAMIL DAY SIGNU+0BF4TAMIL MONTH SIGNU+0BF5TAMIL YEAR SIGNU+0BF6TAMIL DEBIT SIGNU+0BF7TAMIL CREDIT SIGNU+0BF8TAMIL AS ABOVE SIGNU+0BF9TAMIL RUPEE SIGNU+0BFATAMIL NUMBER SIGN