terminology - Term for the second letter in Sx, Dx, Rx? - English
https://english.stackexchange.com/questions/314546/term-for-the-second-letter-in-sx-dx-rx
WebMar 18, 2016 · It seems plausible that the medical convention of using 'x' as the second letter of an abbreviation (in, for example, Dx (diagnosis), Sx (symptom or surgery), Fx (family), Hx (history), and Tx (transplant or treatment)) comes from copying the convention of using Rx as an abbreviation of prescription.
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