Japanese language require IME to type, which converts sound written in hiragana to kanji: i.e. you type soba → get “そば” → IME suggests you “蕎麦”. Basically a stretch of modern phone keyboard correction but existed since the 80s.
Nice side effect to it is while there are predetermined sets of conversions coming with IME, it also handles some arbitrary mapping for convenience, i.e. かお(face) → ( ´∀｀) or きょう(today) → 2020/04/08.
iOS Japanese keyboard gives me following for literally number 1: 1 １ ① 一 ⅰ Ⅰ 1K ⒈ ⑴
