Brick & Mortar OED has it:

A name said to have been formerly given in the Staffordshire potteries to a porringer; now applied by antiquaries and collectors to a drinking-cup with two or more handles, attributed to the 17th and 18th c.

Now, let's look up porringer:

A small basin or similar vessel of metal, earthenware, or wood, from which soup, broth, porridge, children's food, etc., is eaten.