The noun 字 (zì) means "character" or "written word" and is one of the most fundamental terms in Chinese. It can refer to a single Chinese character, a written symbol, or handwriting. It also appears in many compound words, such as 汉字 (Chinese character), 名字 (name), and 文字 (writing/script).
这个字我不认识,你能帮我查一下吗?
zhège zì wǒ bú rènshi, nǐ néng bāng wǒ chá yíxià ma?
I don't recognize this character. Can you help me look it up?
她的字写得特别漂亮,像印刷的一样。
tā de zì xiě de tèbié piàoliang, xiàng yìnshuā de yíyàng.
Her handwriting is especially beautiful, like it was printed.
学中文最难的部分就是记住每个字怎么写。
xué Zhōngwén zuì nán de bùfen jiùshì jìzhù měi ge zì zěnme xiě.
The hardest part of learning Chinese is remembering how to write each character.