Playerflags
 

Bot/Robot	Player is run by a program, gets output in a different format
Dark	Player is hidden in the shadows (mostly deaf and mute)
Haven	Prevents others from paging player
Quell	On Gods and Wizards, disables their special powers.
Reverse_Who	Turns the WHO list upside down
Shortflags	Shortens flag-markers to initials, instead of complete words
Tabular_Who	Tabulates WHO nicely (default)
Female	Gender
Male	Gender
Neuter	Gender
Unassigned	Default gender
Creator	Power to build things (aka Constructor/Builder)
Tellall	Player will see maximum data on all things which he/she controls.
Wizard	Power to examine most everything and modify a few things.
God	Power to examine and change all things.
Elder	Power to act as a savings and loan.
Zonked*	A modified Wizard bit for retired wizards.

Roomflags
 

Abode	Players can make this room a home for themself or their things.
Bot	Prevents robots from entering room or paging players in room.
Dark	Cloaks objects and players in the room. (For crowded places)
Haven	Makes players in the room unpageable. (interchangable with NoPages)
Link_Ok	Players can make exits that lead into this room.
NoPages	Makes players in room unpageable. (interchangeable with HAVEN)
NoWhere	Hides location of all players in the room.
NoWho	Prevents all players in room from appearing on the WHO list.
Quell	Wizards cannot teleport into room or use their powers there.
Sticky	Dropped objects hang around util last player leaves (see DROPTO)
Temple	Dropped objects turn into crowns.
Unwanted	Any player may @chown this room to himself/herself.
Windy	Conversation and actions are heard in nearby rooms.

Thingflags
 

Copy	More than one of this object can exist.
Dark	Object is not visible except to people holding it.
Quell	Object is immune to Wizardly tampering/scrying
Sticky	Normally, means it goes home immediately when dropped.  But on copy objects, means player keeps it even if they type home.
Unwanted	Any player may @chown this object to themself, unless it is locked against them.