+ plus

　　- minus multiplied by ;times

　　 divided by

　　= equals

　　 approximately equals

　　 not equal to

　　 less than

　　 greater than

　　 equal to or less than

　　 equal to or greater than round brackets ;parentheses square brackets

　　{ } braces

　　 is a member of the set

　　 is a subset of

　　∽ similar to

　　≌ congruent to denotes an operation

　　 therefore

　　∵ because

　　∶ ratio sign, divided by

　　∷ equals