Sign

標誌 /标志

biāozhì

(a fact that shows that something exists or may happen)

跡象 /迹象

jìxiàng

(a fact that shows that something exists or may happen)

簽字 /签字

qiānzì

(to make (a document) official by writing one's signature)

簽署 /签署

qiānshǔ

(to make (a document) official by writing one's signature)