The core and supplemental books use the Serpentine font for their titles and back cover text (https://www.myfonts.com/fonts/imageclub/serpentine). I’m not sure if it’s familiar to me because I’ve been looking at the pdfs of the books so much, or if it’s used elsewhere in Star Trek. It’s clearly reminiscent of screen-used Star Trek fonts, which I’m sure is why it was selected, but is it actually screen-used?