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What is the third brake light in rear car window called?

The third brake light in the rear car window is typically called a high-mounted stop lamp (HMSL) or center high-mounted stop lamp (CHMSL).

It's sometimes also referred to as the:

* Third brake light

* Rear center brake light

* Cargo lamp

The official name is usually HMSL or CHMSL, but any of these terms are commonly used.