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The Jargon File (version 4.4.7, 29 Dec 2003):

EXCH /eks'ch@/, /eksch/, vt. To exchange two things, each for the other; to swap places. If you point to two people sitting down and say ?Exch!?, you are asking them to trade places. EXCH, meaning EXCHange, was originally the name of a PDP-10 instruction that exchanged the contents of a register and a memory location. Many newer hackers are probably thinking instead of the PostScript exchange operator (which is usually written in lowercase).
The Free On-line Dictionary of Computing (18 March 2015):

EXCH /eks'ch*/ or /eksch/ To exchange two things, each for the other; to swap places. If you point to two people sitting down and say "Exch!", you are asking them to trade places. EXCH, meaning EXCHange, was originally the name of a PDP-10 instruction that exchanged the contents of a register and a memory location. Many newer hackers are probably thinking instead of the PostScript exchange operator (which is usually written in lowercase). [Jargon File] (1999-09-17)