:
Symbol  Format  Data 

:  Code Point 
U+003A 
TeX 
: 

SVG 
In math, the colon symbol has several uses, depending on the context:

In set theory, the colon symbol is used to represent a “such that” statement. Typically, the symbol is used in an expression like this one, which defines the set of complex numbers:
In plain language, this means “the set of elements in the form such that and belong to the set of real numbers and ”.

In algebra, the colon symbol is used to represent a ratio. Typically, the symbol appears in an expression like this:
In plain language, this means the ratio of to .
The semi colon symbol is used in programming languages as a line terminator.
The colon symbol is used in math to denote a condition for a statement. The symbol can be read as "such that" in a math expression.