From OtherSpace: Encyclopedia Galactica
pose[/noeval] <action pose> :<action pose>
pose[/nospace] <action pose> semipose[/noeval] <action pose> ;<action pose>
Displays your name followed by the statement you posed. May be abbreviated by the ':' symbol. Normally, a space is placed between your name and the action you are posing. If you do not wish to have a space inserted, use the /nospace switch, the 'semipose' command, or the ';' symbol and don't add a space between the ; and the <action pose>. The /noeval switch prevents the pose from being evaluated by the parser.
Examples:
If you are player Bob, and you type in ':laughs out loud.' or 'pose laughs out loud.' everybody in the room will see: "Bob laughs out loud."
If you are player Bob, and you type in ';'s smiling today.' or 'pose/nospace 's smiling today.' everybody in the room will see: "Bob's smiling today."