Smith's Dictionary
one who makes public proclamation. The only notice of this officer in the Old Testament occurs in (Daniel 3:4) The term “herald” might be substituted for “preacher” in (1 Timothy 2:7; 2 Timothy 1:11; 2 Peter 2:5)
International Standard Bible Encyclopedia
her'-ald: The word occurs once (Da 3:4) as the translation of the Aramaic word karoz (compare kerux): "Then the herald cried aloud."
See also GAMES.