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That's correct!! A variable it is!! (Wow, that was totally YODA!!) Emotion: big smile

Everybody always forgets the international language of MATHEMATICS!!
AnonymousMabye the x is just meant to mean variable.
Emotion: makeup
So does anyone know if Nx stands for anything in any field, be it mathematical, medical or anything else?
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Rx is a fairly easy one to understand (being derived from a Latin word) and the choice of using medical abbreviations derived from Latin is no co-incidence. Until around the early 18th century, if you had something important to share with other scientists around the work, you had to write in Latin - guys like William Harvey (De Motu Cordis, published 1628) or Michael Servetus (Dispensarium published 1543), for example, where you will actually find the abbreviation "Rx").

QD, mentioned earlier in this topic, is from the Latin words "quaque diem" - which literally means "[once] each day"; it is not Greek.

As far as other adulterations like Dx, Fx, or Tx are concerned, in my humble opinion they were probably coined by those who thought they had that quasi Latin "appeal" in terms their worldwide acceptability (as with the writings of Harvey and Servetus as I have previously mentioned). The fact is that, while Rx is fairly universally accepted and Dx just as widespread, other abbreviations may require a local understanding. One would need to be cautious of using abbreviations beyond the scope of one's daily work. For example, if you were writing a scientific paper then, in my opinion, the best bet would be to avoid using such abbreviations altogether (unless you want others in your field to think you're some intellectual snob) or, at the very least, define what you mean as an appendix to your book/treatise.

That's just my opinion, for what it's worth. For anyone else who may appreciate Latin, here is a favourite quote of mine: "Dicat putat mei peccatorem, sed si dixerit, 'peccator es!', hunc scit?"
Dicat putat mei peccatoris, sed si dixerit, 'peccator et!', hunc scit?"
In addition to the uses of the "?x" in radio we see it other places too. In aviation "Wx" means "weather", "PAx" can mean "passengers", etc. It seems like it is a common substitution in jargon for a commonly used word to be substituted with the first letter or two of that word followed by the "x". You derive the meaning from the field/occupation and context in which it is used.
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this answer is ridiculous. stop spreading this nonsense.
Malco:
According to Stedmans Medical Dictionary Rx means recipe. As, in my experience, Rx is a symbol signifying treatment I suppose recipe can be interpreted as meaning 'treatment' in a medical/nursing/hospital context. X standing alone has meanings which are variable. Its meaning as a suffix would be determined by usage, not by ad hoc invention.
This historical evidence is going to strike you: Rx originates way before the Latin ages, in an ancient Egyptian symbol (see image). This Egyptian symbol of an eye image, represented medicine and one can see the visual similarity. This gradually evolved into an ellipsoid with an oblique line crossing at the bottom. As clinicians we all handwrite an R with the x crossing the Rs leg. Therefore there was no x, and it is an extrapolation from this image into the most similar letters in the written latin. That was the first abbreviation and the rest followed the same rule. Interesting, don't you think?!... Dr. Hilla Bahat
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