A close up of a letter "X" on a <a href="https://en.wikipedia.org/wiki/button_copy" class="extiw" title="w:button copy">button copy</a> traffic sign. The silver circles are <a href="https://en.wikipedia.org/wiki/Retroreflector#For_signs" class="extiw" title="w:Retroreflector">retroreflectors</a>, while the white is non-reflective plastic.
<a href="//commons.wikimedia.org/wiki/User:The_Navigators" title="User:The Navigators">The Navigators</a>
<span class="int-own-work" lang="en">Own work</span>