Symbol: the Bunny
Rabbits are believed to be very lucky because some of them are believed to be fairies or good witches transformed.
When a rabbit crosses your path a change of luck is coming (mostly for the good) and the message is, that you should trust the heavens, the Universe or whatever team of light you choose to believe in bringing you good fortune.
These fluffy playful creatures symbolize Springtime itself as they appear after winter in large numbers.
Rabbits make babies easily and rapidly and this is why seeing a rabbit is considered to be an omen of abundance.
Other meanings: speed, fertility and also fear.