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In the context of flow, a block is an obstruction to flow, either partial or full.
In the context of leasing, a block is a large geographical lease area that may contain separate structures, proven fields or other interests.
In the context of rigging, a block is a pulley (sheave) or set of pulleys, mounted in a housing. The blocks on a rig are the crown (stationary) block at the top of the derrick and the traveling block.