Taken from the General Conference website, which has lots more symbols and their meanings.
Babylon
Oppressive systems, including churches that have strayed from God’s commandments and believed false teachings, and because of that have strayed from loyalty to God (Acts 7:43; 1 Peter 5:13; Revelation 14:8, 17:5, 18:21).
Beast
A nation/state that gives its loyalty or power to Satan and decides to follow him (Daniel 7:17, 7:23).
Bread
Jesus is called the “bread of life” to represent our sustance, all we need (John 6:35). Bread is also used to represent Scrip- ture, the Word of God (John 6:25, 51, 52, 6:63).
Bride of Christ
The Church that hasn’t strayed from Jesus’ commandments and has stayed true and loyal to God (Revelation 21:2,9).
Sea
Multitudes/peoples/nations (Daniel 7:2; Revelation 13:1; 15:2).
Fire
Purification (Malachi 3:2), trials or difficulties (Deuteronomy 18:10; Zechariah 13:9), the Holy Spirit at Pentecost (Luke 3:16) or revival (Luke 3:16).
Fruit or bearing fruit
Deeds and works, specifically those that are habitual (Luke 6:43-45; Matthew 12:33-35).
Clothing, robes or garments
The character one presents in word, deed or appearance (Isaiah 64:4, 59:6).
Seven churches
Seven figurative groups in church history, from the time the church began to the time when Jesus returns to earth the second time (Revelation 1:20).
The spotless, perfect, sacrificial lamb
Represents Jesus sacrificing His life on the cross so we can be reconciled to God (1 Peter 1:19).