A screw head: square <span style="font-size:240%">⊙</span>
Split by <a href="//commons.wikimedia.org/wiki/User:Stannered" title="User:Stannered">Stannered</a>
2007-04-21
<a href="//commons.wikimedia.org/wiki/File:Screw_drive_types2.svg" class="image"><img alt="Screw drive types2.svg" src="https://upload.wikimedia.org/wikipedia/commons/thumb/0/07/Screw_drive_types2.svg/64px-Screw_drive_types2.svg.png" decoding="async" width="64" height="65" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/0/07/Screw_drive_types2.svg/96px-Screw_drive_types2.svg.png 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/0/07/Screw_drive_types2.svg/128px-Screw_drive_types2.svg.png 2x" data-file-width="1223" data-file-height="1234"></a><a href="//commons.wikimedia.org/wiki/File:Screw_drive_types2.svg" title="File:Screw drive types2.svg">Screw drive types2.svg</a>