FLAGS
The flags are displayed as letters following an object's ID number. Flags are
set with the @set command. The flags are: W(izard), S(ticky), L(ink_OK),
D(ark), T(emple), H(aven), A(bode), J(ump_OK), and B(uilder).

Information is available about each flag:
 wizard
 sticky
 link-ok
 dark
 temple
 haven
 abode
 jump-ok
 builder

Get this information by doing help <flagname>, example:
help wizard