The 46 basic Katakana characters mirror Hiragana phonetically but use angular, geometric shapes. They are primarily used for foreign loanwords, technical terms, and emphasis in Japanese writing.
Dakuten (゛) and handakuten (゜) marks modify basic Katakana characters to create 25 voiced and semi-voiced variations, such as ガ (ga) from カ (ka), essential for accurately representing foreign words.
Yōon (contracted sounds) combine Katakana characters with smaller ャ (ya), ュ (yu), or ョ (yo) to create 33 palatalized sounds, crucial for transliterating foreign words like キャンプ (kyanpu/camp).
Though rarely used for numbers (typically written in Kanji or Arabic numerals), Katakana can phonetically represent native Japanese number words like ヒトツ (hitotsu) and フタツ (futatsu).
Katakana employs special punctuation marks and symbols including the lengthening mark (ー) which extends vowel sounds in loanwords, plus iteration marks and standard Japanese punctuation.
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