The <a href="https://en.wikipedia.org/wiki/Square_(geometry)" class="extiw" title="en:Square (geometry)">square</a> is the <a href="https://en.wikipedia.org/wiki/Polyform" class="extiw" title="en:Polyform">base form</a> of the <a href="https://en.wikipedia.org/wiki/polyomino" class="extiw" title="en:polyomino">en:polyominoes</a>. The one-square polyomino is called the monomino.
<ul><li><a href="//commons.wikimedia.org/wiki/File:Monomino.png" title="File:Monomino.png">Monomino.png</a>: <a href="https://en.wikipedia.org/wiki/User:Herbee" class="extiw" title="en:User:Herbee">en:User:Herbee</a></li></ul><p>Original uploader was <a href="https://en.wikipedia.org/wiki/User:Herbee" class="extiw" title="en:User:Herbee">Herbee</a> at <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a>
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<ul><li>derivative work: <a href="//commons.wikimedia.org/wiki/User:Beao" title="User:Beao">Bea</a><b><a href="//commons.wikimedia.org/wiki/User_talk:Beao" title="User talk:Beao">o</a></b></li></ul>
<ul><li><a href="//commons.wikimedia.org/wiki/File:Monomino.png" title="File:Monomino.png">Monomino.png</a></li></ul>