H block | Article about H block by The Free Dictionary
H-block (redirected from H block)
A hollow concrete masonry unit having both ends open in the form of one-half of a cell.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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In Northern Ireland during the Troubles, the notorious HM Prison Maze, used to house paramilitary prisoners, was referred to as "the H Blocks