+  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
　　∩ intersect