x’ 读作 x prime x'’ 读作 x double prime or x second prime x’’’ 读作 x triple prime 点：dot /: slash. \: backslash Punctuation marks apostrophe ( ' ) ( ’ ) brackets ( ( ) ) ( [ ] ) ( { } ) ( 〈 〉 ) colon ( : ) comma ( , ) dashes ( ‒ ) ( – ) ( — ) ( — ) ellipsis ( … ) ( ... ) exclamation mark ( ! ) full stop/period ( . ) hyphen ( - ) ( ‐ ) interrobang ( ‽ ) question mark ( ? ) quotation marks ( ‘ ’ ) ( “ ” ) semicolon ( ; ) slash/solidus ( / ) space ( ) and interpunct ( • ) Other typographer's marks ampersand ( & ) asterisk ( * ) and asterism ( ⁂ ) at ( @ ) backslash ( \ ) bullet ( •, more ) dagger ( † ‡ ) degrees ( ° ) number sign ( # ) prime ( ′ ) tilde ( ~ ) underscore ( _ ) vertical bar/pipe ( | ) + plus 加号；正号 - minus 减号；负号 ± plus or minus 正负号 × is multiplied by 乘号 ÷ is divided by 除号 ＝ is equal to 等于号 ≠ is not equal to 不等于号 ≡ is equivalent to 全等于号 ≌ is equal to or approximately equal to 等于或约等于号 ≈ is approximately equal to 约等于号 ＜ is less than 小于号 ＞ is more than 大于号 ≮ is not less than 不小于号 ≯ is not more than 不大于号 ≤ is less than or equal to 小于或等于号 ≥ is more than or equal to 大于或等于号 % per cent 百分之… ‰ per mill 千分之… ∞ infinity 无限大号 ∝ varies as 与…成比例 √ (square) root 平方根 since; because 因为 ∴ hence 所以 ∷ equals, as (proportion) 等于，成比例 ∠ angle 角 ⌒ semicircle 半圆 ⊙ circle 圆 ○ circumference 圆周 π pi 圆周率 △ triangle 三角形 ⊥ perpendicular to 垂直于 ∪ union of 并，合集 ∩ intersection of 交，通集 ∫ the integral of …的积分 ∑ (sigma) summation of 总和 ° degree 度 ′ minute ...
