Is there a scheme that explains meaning of .Xresources colors for vim syntax highlighting?
For example:
XTerm.vt100.color1 - values, when default theme is on
XTerm.vt100.color2 - variables
and so on.
https://tldp.org/HOWTO/html_single/Text-Terminal-HOWTO/ (https://tldp.org/HOWTO/html_single/Text-Terminal-HOWTO/)
VT100 is an old (very old) model of dumb terminal, the behavior of which can be emulated in a Linux terminal, so I'd guess it refers to the color scheme used in one of those.