came here to say the same thing.<p>It&#x27;s even called the &quot;mini&quot; jack because it&#x27;s a smaller version of the 6.35mm &quot;phone connector&quot; which dates... all the way back to 1878 when it was used for manual telephone exchanges (!)<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Phone_connector_(audio)" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Phone_connector_(audio)</a>