角分符号（Prime,  ′ ）、角秒符号（Double Prime,  ″ ）以及不常用的3个撇的符号（Triple Prime,  ‴ ）是一系列用于表示不同的度量单位的符号，在数学、科学、语言学、音乐等有不同的用途。

角分符号不应与撇号（ ' ）、标准的单引号（ ‘’ ）、尖音符（ ´ ）或重音符（ ` ）；角秒符号不应混淆于垂直双引号（ " ）、标准双引号（ “” ）或同上符号（ 〃 ）混淆。

The prime symbol ( ′ ), double prime symbol ( ″ ), triple prime symbol ( ‴ ), quadruple prime symbol ( ⁗ ) etc., are used to designate units and for other purposes in mathematics, the sciences, linguistics and music. The prime symbol should not be confused with the apostrophe, single quotation mark, acute accent, or grave accent; the double prime symbol should not be confused with the double quotation mark, the ditto mark, or the letter double apostrophe. The prime symbol is very similar to the Hebrew geresh, but in modern fonts the geresh is designed to be aligned with the Hebrew letters and the prime symbol not, so they should not be interchanged.