The <a href="https://en.wikipedia.org/wiki/equilateral_triangle" class="extiw" title="en:equilateral triangle">en:equilateral triangle</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/polyiamond" class="extiw" title="en:polyiamond">en:polyiamonds</a>. The one-triangle polyiamond is called the monoiamond.
<ul><li><a href="//commons.wikimedia.org/wiki/File:Monoiamond.png" title="File:Monoiamond.png">Monoiamond.png</a>: <a href="https://en.wikipedia.org/wiki/User:Herbee" class="extiw" title="en:User:Herbee">en:User:Herbee</a></li></ul><p>The original uploader was <a href="https://en.wikipedia.org/wiki/User:Herbee" class="extiw" title="wikipedia:User:Herbee">Herbee</a> at <a href="https://en.wikipedia.org/wiki/" class="extiw" title="wikipedia:">English Wikipedia</a>.
Later version(s) were uploaded by <a href="https://en.wikipedia.org/wiki/User:Pbroks13" class="extiw" title="en:User:Pbroks13">Pbroks13</a> at <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a>.
</p>
<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:Monoiamond.png" title="File:Monoiamond.png">Monoiamond.png</a></li></ul>