Name of this glassware?
It looks like a vessel for sublimation. The tube going in the top would be filled with cold liquid making a tiny cold finger. The crude mixture is put in the cylindrical cup at the bottom. A vacuum is pulled from the bottom to lower the pressure. The side arm is for pressure release. After the material sublimates and deposits on the cold finger, it can be removed with the pure material on it in order to easily recover the material.