what is case 8?

VB Code:

If KeyAscii < 48 Or KeyAscii > 57 Then 'sets limits for characters
    Select Case KeyAscii 'sets case for the keys
        Case 8
    Case Else
        KeyAscii = 0
    End Select
    End If

for this what is case 8??

8 = backspace

BackSpace

Case vbKeyBackspace would be nicer :)