XmTextGetBaseline(3) on Linux
The text 821641793640, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
A Text function that accesses the y position of the baseline "XmTextGetBaseline" "Text functions" "XmTextGetBaseline"