Anchovy - this is a small fish of the herring family. Animal fat - this generally means fat from a dead animal. It is often contained in cakes, biscuits and margarine. Suet, lard and dripping are all animal fat - although some supermarkets do provide vegetarian suet. Bristle - this is usually animal hair from a pig or some other animal.
Rennet is taken from dead calves stomachs and is used to process the cheese in some way.
E numbers - certain E numbers are derived from animal ingredients. There are many additives that are hard to tell what they're from. Gelling Agents - these are called gelatine and aspic. They cannot be eaten by vegetarians but there are veggie alternatives. Isinglass - this is a very pure form of gelatine which is obtained from the air bladders of freshwater fish.