These would hang on the wall on pegs at the decorating table at a bakery. Traditional icing is firmer than the soft stuff we buy already made. After a cake was iced you would press icing into these molds, remove the piece, moisten the back of it and put it on the cake. I got married while stationed in England and watched some of my cake being made. 'Course that doesn't make me right about what it is, but it reminds me of the icing molds I saw back then.