Delta connection in <a href="https://en.wikipedia.org/wiki/Three-phase_electric_power" class="extiw" title="w:Three-phase electric power">three-phase power</a> networks
Marti Raudsepp (<a href="//commons.wikimedia.org/wiki/User:Intgr" title="User:Intgr">Intgr</a>)
<span class="int-own-work" lang="en">Own work</span>