The Free On-line Dictionary of Computing (19 January 2023):

Communicating Sequential Processes

    (CSP) A notation for concurrency based
   on synchronous message passing and selective communications
   designed by Anthony Hoare in 1978.  It features cobegin
   and coend and was a precursor to occam.

   See also Contextually Communicating Sequential Processes.

   ["Communicating Sequential Processes", A.R. Hoare, P-H 1985].

   (1994-11-01)