BRO ITS A DECIMAL POINT
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A dot can mean several things, depending on the context.It can separate the whole part of a decimal number from the fractional part.It (or a pair of them) are used to indicate repeating decimal expansions.It can indicate a derivative.It can stand for the scalar product of two vectors.
decimals are used when you have part of a whole for examle .362598798 is part of a whole
It is the RADICAL SIGN , its definition is - the symbol used to indicate a nonnegitive square root.
In standard notation, 34.5 is written as "thirty-four point five." This format is used to represent decimal numbers, where the whole number part is stated first, followed by the decimal point, and then the fractional part. In this case, the whole number part is 34, and the fractional part is 0.5, which is equivalent to one-half.
The set of whole numbers is represented by Z.