What does the N, C, S and W at the top right of my keyboard stand for?

What does the N, C, S and W at the top right of my keyboard stand for?

N = Number Lock or Numeric Lock
            Allows you to use the number pad on the right side
 
C = Caps Lock
            Toggling this will cause all letter to generate capital letters
 
S= Scroll Lock
            Allows you to move between cells commonly found on excel sheets
 
W= Windows Lock
            Turning windows lock will disable the Windows key and the Menu key 

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