Red diamond border to locate a city on a map, or a person on a photo, or anything else. Transparent in center, with border 50%.  Width is 20px (might disappear resized smaller, see: <i>Usage</i> and <i>Other versions</i> below).
<a href="//commons.wikimedia.org/wiki/User:Wikid77" title="User:Wikid77">Wikid77</a>
2007-09-07
<span class="int-own-work" lang="en">Own work</span>