Meaning of this symbol?

Does anyone know the meaning of this symbol. It is Celtic. Here is the link to the symbol on a ring. If anyone has any better pictures or more info that would be great. Thanks.

http://horoscopestore.stores.yahoo.net/celtic-trinity-knot-sterling-silver-men-s-band-ring-jewelry-bb-c334.html

Thank you for all of your help, but I have some additional questions. I see that it is a Triquetra, but there seems to be a lot of different styles and kinds. Do they mean different things? If so, what does this particular design mean?

Try this broda

http://www.whats-your-sign.com/celtic-knots.html