Annotated Source: Starcross

Set for glowing objects and permanently-illuminated rooms.

Set for room with air but no gravity.

Set for rooms with gravity and a solid floor. The practical effect is that the disks work in such rooms.

Not applied to real objects. RMUNGBIT is a hack used in grammar lines; it means the object is optional (but the preposition before it is required). This allows the parser to accept commands like LOOK AROUND.

Set for rooms in outer space. You need the SPACESUIT to survive.

Generally set for living beings, though not the ADVENTURER.

This is almost the same as VILLAIN, but some verbs use VILLAIN and some VICBIT, with no obvious pattern.

Generally set for living beings, although they may or may not be villainous. Also the NEST, probably so that you can assault it.

Compare VICBIT.

The ADVENTURER has the VILLAIN flag, which leads to a few buggy messages. Try HELLO ME or WAKE ME, for example.