slice bar

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. An iron tool with a broad flat end, used to loosen and clear out clinkers from furnace grates.

GNU Webster's 1913

1. n. a kind of fire iron resembling a poker, with a broad, flat end, for stirring a fire of coals, and clearing it and the grate bars from clinkers, ashes, etc.; a slice.

WordNet 3.0

1. n. iron bar used to loosen and rake clinkers out of furnaces