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+ 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 less than 小于号 is greater 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 root 根 ∵ since; because 因为 hence 所以 ∷ equals; as 等于;成比例 = 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 angle 角 ⌒ semicircle 半圆 ⊙ circle 圆 ○ circumference 圆周 pi 圆周率 | 
