(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

(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)

in kambun, a type of kaeriten in which the reading order is marked with numbers 1, 2, 3... indicating the order

astigmatism (defect of a lens)

(dated) something that stands out among many other things / (figuratively) a single woman among many men

decimal point, radix point

dotting the i's and crossing the t's

(literally) know the other side and yourself, a hundred battles will not be perilous

(literally) a beautiful single red flower that blooms within a field of trees and grass / (figuratively) something unique that stands out among many other things