I am using the following macro for unit type setting in 1.99.8 and I am happy with the results. 

On Sat, Mar 9, 2019 at 8:48 PM Giovanni Piredda <address@hidden> wrote:

Am 09.03.2019 um 23:25 schrieb Joseph Stavitsky:

https://imgur.com/a/JPxXRVb

The letters circled in red in the referenced image are italicized because they are a single letter following a number. If I understand correctly, TeXmacs interprets them as variables when my intent is to specify unit abbreviations. Is there a global setting to prevent this and/or a way to correct individual letters?

Platform: Win10 x64 

TexMacs version: 1.99.8

One possibility is to mark the letter as text in 1.99.9 (and it shold be te same in 1.99.8 that you are using). Once that you are inside an equation ,from the menu:"Insert" then "text".

It is also possible to define a macro "unit", that you could use for the measurement units; I copy here a macro that I wrote and put in a package which I can add to documents

 <assign|unit|<macro|name|<with|font-shape|normal|math-font-shape|right|<arg|name>>>>

I use this by inserting it with a slash inside the formula

\unit

and then press return: it gives me a field in which I then type the unit, whic appears in upright font. It seems to me that there is another way too to insert macros, but I have not learnt it :-)

I tested it minimally, it seems to work; and it is easy enough that it should work ... And I do not know if it is written best, that it what I learnt from the manual till now.

Finally, I think it is SI convention to insert a space between the number and the unit, pls. see #15 in https://physics.nist.gov/cuu/Units/checklist.html