could be your specific god and goddess, like if you follow Ra and Isis. more likely though it speaks of the Horned God and the Triple Goddess of Wicca and most pagan paths. it can be switched out if you believe in Zeus and Juno or something, but that's what it refers. if you don't believe in them though, you shouldn't be calling on them. it's like trying to speak to someones imaginary friend, you don't believe they're real, so why are you trying to talk with them?
if you don't know who the Horned God or the Triple Goddess is, i suggest you research a bit. it's easier to find information on the Goddess than the God, but it's still easy to find a basic who they are.