What is the name of this plastic piece?

A locked cardoor of a 50 year old classic 2dr hardtop is no deterrent to anyone, and I'm not interested in replacing broken windows; so I just leave the doors unlocked. For some years I didn't even have a key for the doors. There's no telling how many people have sat in my bucket, besides me,lol.

I look at it this way; if TOO MANY CAPS IN A ROW ARE MAKING KIDS CRY, then they are not likely to know how to drive stick anyway, nevermind knowing how to hotwire it,lol. So if someone just wants to keep my bucket warm, I'm OK with that.