On "top" of the TV "set." A reference to the first cable TV boxes that were typically placed on top of the TV set. See set-top box.
"set top." YourDictionary, n.d. Web. 25 June 2018. <http://www.yourdictionary.com/set-top>.
set top. (n.d.). Retrieved June 25th, 2018, from http://www.yourdictionary.com/set-top
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