V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

ICQ
       [I seek you] (Internet, ICQ, IM)


The Free On-line Dictionary of Computing (30 December 2018):

ICQ

    1. Abbreviation for "I seek you".

   2. A proprietary chat system created by a couple of israeli
   guys, who later founded "mirabilis".  ICQ was sold to America
   On-Line around 1998.

   The name "ICQ" is a play on "cq", the radio signal for seeking
   conversation.

   (http://icq.com/).

   [Confirm derivation?  TCP?  Summary?]

   (2000-04-03)