reveal pin

reveal pin, reveal tie

An adjustable clamp, placed horizontally across an opening in a wall; used to hold scaffolding against the wall.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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Aggressive and manipulative phone calls to victims to reveal PIN numbers is just one example of this."
Police have warned people never to reveal PIN numbers or personal financial information to unknown callers.
Banks never ask customers to reveal PIN numbers or full password details.