Aterm describes when two pieces of data result in the same value is?

Assignment is the term that describes when two pieces of data result in the same value.  An assignment statement sets and/or re-sets the value stored in the storage location,denoted by a variable name. It copies a value into the variable. The most commonly used notation for assignment is: x=expr.

Assignments  allows a variable to hold different values at different times during its life-span and scope.