SIGN Determines the sign of a number, the result of a calculation, or a value in a column. The function returns 1 if the number is positive, 0 (zero) if the number is zero, or -1 if the number is negative.
Syntax
SIGN(number)
Parameters
Number – Any real number, a column that contains numbers, or an expression that evaluates to a number.
Return Value
A whole number. The possible Return values are 1, 0, and -1.
Reference Data
https://docs.microsoft.com/en-us/dax/dax-function-reference