<a href="https://en.wikipedia.org/wiki/NPN_transistor" class="extiw" title="w:NPN transistor">NPN transistor</a> symbol with case, no label
<a href="//commons.wikimedia.org/wiki/User:Zedh" title="User:Zedh">Zedh</a>
2007-11-11
<span class="int-own-work" lang="en">Own work</span>