Comparison operators
Comparison operators compare two values and return either True or False. (Such expressions are sometimes called Boolean expressions.) Mathematically, a result of True equals 1 and False equals 0.
 
True if the value on the left is greater than or equal to the value on the right
True if the value on the left is less than or equal to the value on the right
Note  You can also use <> for Not Equal To (), >= for Greater Than or Equal To (), and <= for Less Than or Equal To ().
Related topics 
About formulas