vampire tap
 n.— «I had not heard of this usage regarding power consumption until this thread, however “vampire tap” in electronic parlance refers to a piercing type of cable connector, most often a coaxial connector used in Ethernet 10base5 wiring.» —“Re: vampires and power usage” by msg Usenet: alt.home.repair June 15, 2007. (source: Double-Tongued Dictionary)

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