I want to be able to use the Greek letters stigma Ϛ ϛ, koppa Ϙ ϙ Ϟ ϟ, sampi Ͳ ͳ Ϡ ϡ, digamma Ϝ ϝ Ͷ ͷ, heta Ͱ ͱ, san Ϻ ϻ, in Computer Modern font, so that they would look like the other Greek letters alpha α, beta β, etc, in their default form in LaTeX.
I found the arevmath package, but it is for a different font. However in this list of symbols from the package, there are the symbols I'm looking for in the "Text" column, with the lowercase one not in italic (contrary to default looking greek letters in LaTeX).
Screenshot took from the link above. In red the letters I'm looking for.
Zoom of the red part :
But I didn't found any doc that tells you how to use them. The commands provided by arevmath, such as \stigma, displays like in the "Math" column.


\koppathat will display ϙ in the XITS math font. – Nolord Oct 31 '22 at 14:52