Two doves symbolize enduring, ever-faithful love. The symbol probably arose because turtle doves mate for life and spend a lot of time engaging in affectionate behaviors. The two-dove symbol predates Christianity and can be found on ancient coins, monuments and catacombs.
In pre-Christian symbols, the dove can represent love and fertility. Doves are closely associated with rain in nature worship.
The dove in Christianity symbolizes innocence and gentleness. It can also symbolize the Holy Ghost, or if in groups of seven, symbolize the gifts of the Holy Ghost. Doves have also been used to represent a herald of good tidings.