This operator converts the expressions to the right of the operator into numeric types and divides them integer.
Example
Dim V1 As Long, V2 As Long, V3 As Double
V1 := 210
V2 := 20
V3 := V1 \ V2
Result:
V3 contains a value of 10, because 210 can be divided 10 times by 20 without any rest.