Section 10,28: SS

 (Suppress Sign)

 Causes the processor to suppress a leading plus character from any
 position where this character would otherwise be optional.  It has
 the opposite effect of the SP field descriptor.

 The SS descriptor affects all subsequent I, F, E, D, and G editing
 (in the same FORMAT statement) during the execution of an output
 statement.  This descriptor affects all fields that follow it,
 until an S or SS is encountered.