Katakana is a symbol system of which language?
Katakana also uses three handakuten modified katakana, セ゚ ([tse]), and ツ゚ or ト゚ ([tu̜]). In Unicode, the Katakana Phonetic Extensions block (U+31F0–U+31FF) exists for Ainu language support. These characters are used for the Ainu language only. Taiwanese kana (タイ ヲァヌ ギイ カア ビェン) is a katakana-based writing system once used to write Holo Taiwanese, when Taiwan was under Japanese control. It functioned as a phonetic guide for Chinese characters, much like furigana in Japanese or Zhùyīn fúhào in Chinese. There were similar systems for other languages in Taiwan as well, including Hakka and Formosan languages. Unlike Japanese or Ainu, Taiwanese kana
Katakana are used similarly to the Zhùyīn fúhào characters, with kana serving as initials, vowel medials and consonant finals, marked with tonal marks. A dot below the initial kana represents aspirated consonants, and チ, ツ, サ, セ, ソ, ウ and オ with a superpositional bar represent sounds found only in Taiwanese. Katakana is used as a phonetic guide for the Okinawan language, unlike the various other systems to represent Okinawan, which use hiragana with extensions. The system was devised by the Okinawa Center of Language Study of the University of the Ryukyus. It uses many extensions and yōon to show the