What is the meaning of a St. Christopher medal?

A Taoist (Yin & Yang) interpretation of the symbolism of St Christopher carrying the Christ child is that they are two parts of the same person (hence the name). Christopher is the strong in limb, lumbering ego self and he was waiting for years to serve (or discover) his Higher Self and carry Himself across the water (the flow of life energy). In other Words discover his own enlightenment. The great being he was waiting for was simply the miraculous child (the untainted unconscious mind) who became heavier as he was carried.. representing the commitment to self realisation through service, the weight is the ultimate service to mankind, which is enlightenment.The aspect of the traveler is the follower of inner The Path.