つ゚

Etymology
The character with a handakuten.

Usage notes
This character is a borrowing from the Ainu syllable, and is not included in JIS X 0213. However, in Christian materials and literary texts, examples of the Latin syllables /tu/ and /du/ being transcribed as つ゚ has been confirmed.

During the Edo period, some tōon literary materials used this kana to transcribe the Chinese syllable /tu/. This is no longer common today, as is preferred for all transcriptions of /tu/ instead.