here is source material by ex-FC lore dev, then CCP Demiurge, who designed the Triglavian glyphs:
https://www.artstation.com/artwork/QdKO8
there are links to png and font files in the material description, you can install in your system to write Triglavian messages in text editors or graphic editing software
Edit:
There is another set of glyphs used, since some time. I think it’s called Upwell script.
here is a link to thread discussion on it when it appeared in-game few months ago: