a398bbfd_rary___iRise_Developer_Network__Use
[Property] 1000's Separator [Expects / Produces] Selection (none, comma, period, space). [Use] 
Designates the separator that should be used to delimit sets of three digits when the displayed value exceeds 999. Not valid for the Plain text format.
Number Formatter - iBloc Library - iRise Developer Network
Use