Sowerby called it a "sweet" in their catalogues. You could call it a "sweetmeat" too. It would have been for serving sweets, confectionery, tidbits etc. Carnival Glass collectors call this shape a handled nappy (just to confuse

). It's Sowerby's number 2381 Service. Carnival collectors call it "Portcullis". The shape is known in Carnival - your Ruby glass is lovely too.
Glen