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Acronymfinder.com lists TX as a rare abbreviation for "transaction", particularly in the context of computers. It use by the Bitcoin protocol may be its best-known application, but I've also found a few other instances. As the Acronym Finder suggests, it seems to be used sparingly at best, and I've found no non-technology-related uses of it.

Does anybody know of an origin or first use of abbreviating "transaction" as "tx"?

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    Sometimes it's also TXN.
    – tchrist
    Commented Feb 22, 2015 at 22:38
  • I have seen this in the context of older (think 1990's, e.g. Great Plains) computer implementations of accounting systems a number of times, for instance as the first two characters of transaction references, the remaining characters being digits.
    – R Foster
    Commented Apr 10, 2017 at 23:50
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    Medicine has a tendency to abbreviate many things using X: Biopsy - Bx, Dx - diagnosis, Fx - fracture, Hx - history, Sx - surgery, and Tx - transplant, transformation, transaction, therapy, treatment (though transaction is not the most common of terms in medicine).
    – Mitch
    Commented Apr 11, 2017 at 0:05
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    I'll note that "X" is a common way to abbreviate "trans", as in "xmit" for "transmit". But somewhere along the way the X got twisted to where some writers/coders use "TX" for "transmit" and "RX" for "receive".
    – Hot Licks
    Commented Apr 11, 2017 at 1:32
  • See also this Q on Rx, this on Rx/Sx/etc, and lots of other questions.
    – Stuart F
    Commented Dec 11, 2023 at 20:08

3 Answers 3

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I will go with @undefined: the abbreviation TX for internet transaction is borrowed from telegraph abbreviation for transmission, Tx, for an internet transaction involves sending a coded signal from my computer to , say Amazon.com, internet site.

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In the old days amateur radio operators, who abbreviated wildly because they were using Morse code keys to exchange information, used to use XCVR as transceiver and XMTR as transmitter. A lot of older programmers also have amateur radio licenses so they probably just continued the tradition. I cannot begin to guess how you would ever find the first use of TX, but I would bet it's everywhere in early data communication standards documentation.

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I have no evidence to support this answer, so feel free to downvote it, but this might help:

The X, itself, stands for trans (see also the answer by @undefined, with examples). I believe (again, I don't have proof) that this comes from the association of trans with its meaning of across (hence, a cross).

A guess (only a guess) would be that TX is related to this use of X.

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