A trapezoid notation (such as <a href="//commons.wikimedia.org/wiki/File:Trapezoid_small_icon.png" class="image"><img alt="Trapezoid small icon.png" src="https://upload.wikimedia.org/wikipedia/commons/thumb/c/c2/Trapezoid_small_icon.png/10px-Trapezoid_small_icon.png" decoding="async" width="10" height="10" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/c/c2/Trapezoid_small_icon.png/15px-Trapezoid_small_icon.png 1.5x, https://upload.wikimedia.org/wikipedia/commons/c/c2/Trapezoid_small_icon.png 2x" data-file-width="16" data-file-height="16"></a> <i>ABCD</i>)
<a href="https://en.wikipedia.org/wiki/User:Sidious1701" class="extiw" title="wikipedia:User:Sidious1701">Sidious1701</a> at <a href="https://en.wikipedia.org/wiki/" class="extiw" title="wikipedia:">English Wikipedia</a>
6 May 2008 (original upload date)
<span class="int-own-work" lang="en">Own work</span> (<span lang="en" dir="ltr">Original text: <i><bdi lang="">self-made</bdi></i></span>)