Shut down :
World war II engineers used binary system 1("on") and off ("0") to label their power button.
In 1973, the International Electrotechnical Commission codified a broken circle with a line inside it as "standby power state," and sticks to that story even now. The Institute of Electrical and Electronics Engineers, however, decided that was too vague, and altered the definition to simply mean power.
Ethernet :
The Ethernet symbol was designed by IBM's David Hill. According to Hill, the symbol was part of a set of symbols that were all meant to depict the various local area network connections available at the time. The array of blocks, which are purposefully non-hierarchical, each represent computers/terminals. While Hill makes no specific mention of Bob Metcalfe's earliest Ethernet sketches, it's easy to see how the modern symbol uses them for inspiration.
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