Say

Usage: say [message].
       say last

This command allows a player to say something that will be seen by all
other players in the same room. Typing 'say last' shows you all things
you remember having heard people to say.

You may also use adverbs by enclosing them in angle brackets with the say
command. ('help adverbs')

For example:
  PROMPT> say <angrily> Is this syntax sane?'
  You angrily say: Is this syntax sane?

See also: tell, whisper, emote, last