- a pulley, thimble, etc., used to guide a rope forming part of the rigging of a ship, crane, etc., in such a way as to prevent chafing.
- (on power shovels or cranes) a swiveling mounting for sheaves, over which cables pass.
- a block or ring through which a line is rove to keep it clear of obstructions, prevent chafing, or maintain it at an angle
