set status_umode [<text>]
This variable contains the string used in the status bar when the client has one or more user modes set. If no user modes are set, nothing is displayed.
This string is represented at %# in the STATUS_FORMAT string. If the expando is used inside STATUS_UMODE, it expands to the client's current user mode.
Customizing the display of the current user mode in the status bar:
/set status_umode UserMode: %#