from
Easton's 1897 Bible Dictionary
Trumpets
were of a great variety of forms, and were made of divers
materials. Some were made of silver (Num. 10:2), and were used
only by the priests in announcing the approach of festivals and
in giving signals of war. Some were also made of rams' horns
(Josh. 6:8). They were blown at special festivals, and to herald
the arrival of special seasons (Lev. 23:24; 25:9; 1 Chr. 15:24;
2 Chr. 29:27; Ps. 81:3; 98:6).
"Trumpets" are among the symbols used in the Book of
Revelation (Rev. 1:10; 8:2). (See {HORN}.)