I am not sure if you are looking for a symbol as in a sign or a charm that is commonly used for good luck. White cats, white birds are symbols or signs of good luck. humming birds.. im having trouble answering this question if you ask for symbols because its too general. If you are looking for items carried by mexicans that bring good luck then this can be anything from High John root, rabbits foot, mojo bags made for money or protection are very common around here, carrying a stamp of your patron saint is another very simple yet effective charm for protection. Jade is quickly comming into play as well. There are just so many charms that can be used for this. As someone states, to see an Eagle at a time when you are seeking answers or starting something is a very good sign.