If something is identifiable, it means you can identify it — or know what it is. Put your name in your jacket so it is identifiable as yours.
Identifiable can also mean known — if you're trying to solve the energy crisis, you should come up with a plan that maximizes the all identifiable uses of alternative energy. If you have feelings that other can relate to, you are identifiable — people feel that they know you. If you wear a cross around your neck, that is communicating your identity — making you identifiable as a Christian.