Any word starting with a letter and placed before an = sign, i.e., where a keyword is expected, is assumed to be the name of a variable. The variable is assigned the value of the expression following the = sign.

 

Pointer = 2   ; this assigns the value 2 to the variable: Pointer

Unit = (1+3)  ; this assigns 4 to the variable: Unit

Name="London" ; this assigns "London" to the variable: Name

$Label = 1, Pointer+Unit,Name ; defines the current element in facet 1, to have element

; number 4+2=6, and identifying label "London"