U+0920 Devanagari Letter Ttha

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Ṭha (also romanized as Ttha) is a consonant of Indic abugidas. In modern Indic scripts, Ṭha is derived from the early "Ashoka" Brahmi letter after having gone through the Gupta letter . As with the other cerebral consonants, ṭha is not found in most scripts for Tai, Sino-Tibetan, and other non-Indic languages, except for a few scripts, which retain these letters for transcribing Sanskrit religious terms.

Aryabhata used Devanagari letters for numbers, very similar to the Greek numerals, even after the invention of Indian numerals. The values of the different forms of ठ are:

• ठ [ʈʰə] = 12 (१२)
• ठि [ʈʰɪ] = 1,200 (१२००)
• ठु [ʈʰʊ] = 120,000 (१ २० ०००)
• ठृ [ʈʰri] = 12,000,000 (१ २० ०० ०००)
• ठॢ [ʈʰlə] = 1,200,000,000 (१ २० ०० ०० ०००)
• ठे [ʈʰe] = 12×10¹⁰ (१२×१०^१०)
• ठै [ʈʰɛː] = 12×10¹² (१२×१०^१२)
• ठो [ʈʰoː] = 12×10¹⁴ (१२×१०^१४)
• ठौ [ʈʰɔː] = 12×10¹⁶ (१२×१०^१६)