1157 is a Dual Filament type Bulb.
It uses a bayonet style base, and on the bottom it has (two) connections, which allows it to be a useful bulb for both brake, and blinker / turn indicators. Faq. What is the difference between a 1156 bulb and a 1157 bulb?
1156 is a single element lamp (reverse light, tail light) 1157 is a dual element lamp (brake light and turn signal light in one bulb) https://www.youtube.com/watch?v=X84vEfkjb9s
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