Wondering if anyone has an idea what this piece of glass is called or might have been used for. 11cm tall, double conical form waisted form with open hole, one end slightly taller than the other at 6cm and 5cm, but diameter is the same at both end 5.5cm. Whether it is a stand for an egg or something, or a medical instrument? there does seem to be wear at one end more than the other. Any help or ideas would be greatly appreciated.