Power cable 5G16 
<ul><li>5 means 5 wires</li>
<li>G means GROUND wire (green-yellow)</li>
<li>16 means each wire is 16mm²</li></ul>
<a href="//commons.wikimedia.org/wiki/User:Dmitry_G" title="User:Dmitry G">Dmitry G</a>
<span class="int-own-work" lang="en">Own work</span>