The computer security code printed on the back of Visa credit cards. The CW is actually the three letters C-V-V, but looks like "CW" because proportional fonts squash the two V's together. See CSC.
"CW number." YourDictionary, n.d. Web. 23 June 2018. <http://www.yourdictionary.com/cw-number>.
CW number. (n.d.). Retrieved June 23rd, 2018, from http://www.yourdictionary.com/cw-number
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