U+2334 • symbol
The Counterbore symbol (⌴) is a technical symbol used in engineering drawings to indicate a counterbore hole feature. It specifies a cylindrical flat-bottomed hole enlargement for accommodating bolt heads or fasteners.
The Symbol For Counterbore (⌴) is a unicode character in the Basic Multilingual Plane Plane. It is found in the Miscellaneous Technical block and was approved as part of Unicode Version 1.1 in 1993
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