Found thirty-five times in the book of Revelation, plus a few other places (Mk. 1:13; Acts 10:12; 11:6; 28:4-5; Tit. 1:12; Heb. 12:20; Jas. 3:7), the Greek noun “therion” meant “beast” or “wild animal.”  John used this word to describe evil forces opposing the people of God.  The first use of this term in the book of Revelation is found in 6:8 and the last reference is 20:10.  It is found most often in Rev. 13 and Rev. 17.