I recently came across a really useful Computer Hardware Chart made by a member on Deviantart that helps you visually identify various types of plugs, ports, sockets and RAM.
Most technicians should already know how to identify many of these, but there a quite a lot of lesser known plugs and ports that I either haven’t seen before or have seen, but didn’t know what it was called.

I have provided a link to a shrunken down version for easy web viewing that is only 2mb in size and an extremely high resolution version that weighs in at 24mb.

Images:
You can also get these graphics printed as a poster to hang in your workshop over at DeviantArt via this link.

Low Resolution Web Version (2mb)

Ultra High Resolution Version (24mb)

Source: Technibble.com