Does anyone know the function of this

This particular photo is of a Concorde but I have seen similar things of the AI's (FS2004) MD80's. Just wondering what it's there for.
Thanks
















However, for the most part, pretty much everything hits it and falls right off, nothing really sticks except a very thin layer of mud to the bottom, mainly (guessing) because of the airflow around the wheels after takeoff and before landing.

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