indented bar

deformed bar, deformed reinforcing bar

deformed bars
A steel reinforcing bar which is manufactured
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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However, talking about setting up the tracking capability, CalsonicKansei's engineering director, Steve Burnette, says, "We created a plan to use a unique indented bar coding system--not a stick-on label, but a permanent mark that becomes part of the product and is readable throughout its service life--as a primary key, or pointer, for our database.