Portal symbol with question mark
<a href="//commons.wikimedia.org/wiki/User:MayaSimFan" title="User:MayaSimFan">User:MayaSimFan</a> (this version)
CC BY-SA 3.0
<a href="//commons.wikimedia.org/wiki/File:Portal_blue.png" class="image"><img alt="Portal blue.png" src="https://upload.wikimedia.org/wikipedia/commons/5/53/Portal_blue.png" decoding="async" width="150" height="150" data-file-width="150" data-file-height="150"></a>