plus 加号；正号
- minus 减号；负号
± plus or minus 正负号
× is multiplied by 乘号
&pide; is pided 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 相当于或约等于号
≈ 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…
‰ per mill 千分之…
∞ infinity 无穷大号
∝ varies as 与…成占比
√ (square) root 平方根
∵ since; because 由于
∴ hence 因此
∷ equals, as (proportion) 相当于，成占比
∠ angle 角
⌒ semicircle 半圆形
⊙ circle 圆
○ circumference 圆上
π pi 圆周率
△ triangle 三角形
⊥ perpendicular to 垂直平分
∪ union of 并，合辑
∩ intersection of 交，通集
∫ the integral of …的積分
∑ (sigma) summation of 总数
° degree 度
′ minute 分
″ second 秒
℃ Celsius system ℃
