Aspect "carré" displayed by color light signal of type "C" protecting block section of BAL.
<a href="//commons.wikimedia.org/w/index.php?title=User:Madcap&amp;action=edit&amp;redlink=1" class="new" title="User:Madcap (page does not exist)">Madcap</a>
<span class="int-own-work" lang="en">Own work</span>