sign

Japanese: サイン

〘noun〙 (sign)① (━suru) To write one's own name with one's own hand. Also, the characters. It particularly refers to when celebrities write in their own style to please their fans, or when they write on securities documents instead of a seal. Signature. Autograph. *New York (1914)〈Harada Muneichiro〉Watching Broadway from the side, "Actually, Admiral Togo's signature was here." ② A secret signal between teammates in sports competitions so that the opposing team does not know. Also, a signal agreed upon between certain people. Signal. *Baseball (Attack) (1927)〈Toda Suishū〉2 "Give the runner a sign to steal." ③ Generally refers to a symbol, signal, code, indicator, etc. [Handbook of Foreign Languages (1912)] *Dark Room (1976)〈Yoshiyuki Junnosuke〉30 "The 'fasten seat belts' sign has been given."

sign

〘Noun〙 (sine)① One of the trigonometric ratios. In a triangle ABC, when angle C is a right angle, the ratio of sides AC and AB is called the sine of angle B and is written as sinB. Sine. ② One of the trigonometric functions. A function whose domain is all real numbers, obtained by extending sine to general angles. Expressed as y=sinx. The sine function.

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙 (sign)① (━する) 自分の名を自分の手で書くこと。また、その字。特に、有名人がファンを喜ばせるために独自の字体で書くものや、証券類に捺印のかわりに記すものをいう。署名。自署。※紐育（1914）〈原田棟一郎〉横に観たブロードウエー「実は此処にアドミラル東郷の署名(サイン)があったのだが」② スポーツ競技で、敵チームにわからないよう、味方同士が秘密の動作で行なう合図。また、ある人たちのあいだで取り決めた合図。シグナル。※ベースボール（攻撃篇）（1927）〈飛田穂洲〉二「盗塁のサインを走者に与へ」③ 一般に、記号・信号・符号・指標などをいう。〔舶来語便覧（1912）〕※暗室（1976）〈吉行淳之介〉三〇「『座席ベルト着用』のサインが出た」