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Interesting. I don't know anything about this symbol, but I might be able to help you interperet your dream.
What colors stood out to you?
Were there any sounds?
Was the symbol floating? Or was it on something, maybe a sheet of paper?
Do you remember what you dreamed before or afterwards?

Thanks for offering, Electric Snowball--I guess I'll have to take you up on this. In increments, if you do not mind; this dream is rather long. I remembered all of my dream...except it was really long so I decided that I'd save my fingers some work and just ask about the symbol meant.
At the beginning of my dream I was getting married for the first time in the dream (over all, I get married twice XD) to this tall, balding man with small eyes that were really close together. I was wearing a really traditional wedding dress (I cannot stand traditional wedding dresses for reasons unknown). The wedding itself was in the high school that I would have went to if I had not opted to go to private school, and the floor was tan.
Anyways we were suddenly at the altar, and the priest started to play a game of trivia at the altar with my husband. o___O Random questions about random things, don't remember what they were, but they had nothing to do with the marriage. And, the priest's last trivia question was "Do you take this girl?" and he said yes. I didn't have a say in it. Anyways, my new husband and I were walking out a set of double doors, to the outside--my parents and little brother were outside (they approved of the marriage), and I was in between both of the double doors. My husband was still inside, and was throwing the symbol up in the air, and catching it in his mouth. Most of the time he would catch it, but sometimes it would clatter on the floor, and he would pick it up and start over. I am pretty sure it was made of metal, and at first I thought it was a hairpin.

Interesting. Your husband might be the greek god Hephaestus. Your description matches those I have heard. Did he possibly have a lame leg? AN dhte symbol might simply be a horseshoe, since Hephaestus is the god of blacksmiths.

I we're assuming your second dream husband was still greek, he might have been Perseus. Perseus was a mortal hero, though he was very handsome blue-eyed, and blond. Perseus wasn't blind, but that might be referring to when in his battle with Medusa, he could only look at her reflection to avoid being turned to stone. It's a bit of a stretch, though.

I don't think so. The sign of gemini looks like this

The other husband might be hermes, God of the sky. And upside down horseshoe is one where the opening is facing the ground and the closed curve points toward the sky. Your Welcome! I'm a dream analyst, so if you need anything...

If it is, maybe you can blame sublimial advertising.