Giant is a monster type in ADOM. Essentially, the type is a subtype of humanoid — all members of the group are also considered as humanoids, with just some extra vulnerabilities. Great physical strength is of course a common attribute amongst giants, as is their corresponding ability to grant the PC some extra strength when (s)he eats them. Also, most giants use missile weapons.
All monsters in the giant class are indicated by the symbols 'H' or 'O'.