I don't know what its called but here is a link to an examle of one.

I use a glass(pyrex) martini stir stick. It has a rounded knob like end about the thickness of a thumb and 12 in long. It is long enough that I can use it flat on my back hips raised to allow the cum dribbles to fall on my face or chest. Or I can go knee chest position and drip onto a plate for ...