astigmatism (defect of a lens)

break-even point

ditto mark (〃)

(typography) the iteration mark 〻, used to repeat kanji, historically mostly kanji with kun'yomi

(mathematics) A Japanese system of algebra for polynomial equations, adopted from 天(てん)元(げん)術(じゅつ) (tengenjutsu)

(mahjong) determining what tile would complete an opponent's hand

three-dot ellipsis: …

handstand

(typography) the iteration mark 々, used to repeat kanji

(typography) each mark of the pairs of iteration marks ゝ/ゞ and ヽ/ヾ, respectively used to repeat 清音 (seion)/濁音 (dakuon) hiragana and katakana