当て字
JLPT N1 · Nounあてじ(ateji)声调 0
kanji used as a phonetic symbol, instead of for the meaning; phonetic-equivalent character; substitute character; kanji used for their meaning, irrespective of reading; Ateji
「目出度い」の漢字は当て字だ。— The kanji for "medetai" are phonetic borrowings (ateji).