[@Muttonhawk]

Hieroglyphics are mentioned in one of my Vetros posts and a (possibly different) writing system is used to make records in the Temple of the Bond as part of Kho's Yara post.

So the Vetruvians have some vaguely-mentioned writing system(s), possibly taught to them by Ventus. Ventus spent some khookies a while to spread technology from other parts of Galbar to the Vetruvians.