常用标点符号

+　 plus　加号；正号<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> 

-　 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 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 

√　(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　分 

″　second　秒 

℃　Celsius system　摄氏度 

{　open brace; open curly　左花括号 

}　close brace; close curly　右花括号 

(　open parenthesis; open paren　左圆括号 

)　close parenthesis; close paren　右圆括号