Gammon

Gammon in British English is the hind leg of pork after it has been cured by dry-salting or brining, and may or may not be smoked. Strictly speaking, a gammon is the bottom end of a whole side of bacon ; ham is just the back leg cured on its own. Like bacon it must be cooked before it can be eaten; in that sense gammon is comparable to fresh pork meat, and different from dry-cured ham like jamón serrano or prosciutto. The term is mostly used in the United Kingdom and Ireland; other dialects of English largely make no distinction between gammon and ham. Ham hock, gammon hock, or knuckle, is the back end of the joint, and contains more connective tissue and sinew. In the United Kingdom and Ireland, joints of cooked gammon are often served at Christmas, but is produced and sold throughout the year. It can be found in most supermarkets either as a full joint or sliced into steaks, which can then be cooked via pan frying or grilling in a manner similar to bacon.

Source: Wikipedia