A transparent circle on a light-colored background (<a href="https://en.wikipedia.org/wiki/Hex_triplet" class="extiw" title="wikipedia:Hex triplet">hex color code</a> <code>#F9F9F9</code>), designed to be placed over content to show only that portion within the circle. The circle has a black border 0.5% as wide as its outside diameter.
<a href="//commons.wikimedia.org/wiki/User:PleaseStand" title="User:PleaseStand">PleaseStand</a>
<span class="int-own-work" lang="en">Own work</span>