global

global s -- provides the global symbol s, even if s currently has a value.

     i1 = num
     
     o1 = num
     
     o1 : Symbol

     i2 = num = 5
     
     o2 = 5

     i3 = num
     
     o3 = 5

     i4 = global num
     
     o4 = num
     
     o4 : Symbol