How many competing protocols are there for displaying images in a terminal? There's this, iTerm2 (also supported by Secure Shell[1])... any others? We need one

How many competing protocols are there for displaying images in a terminal? There's this, iTerm2 (also supported by Secure Shell[1])... any others? We need one unified standard[2] for graphics in terminal emulators! [1] https://chromium.googlesource.com/apps/libapps/+/HEAD/hterm/doc/ControlSequences.md#osc-1337 https://chromium.googlesource.com/apps/libapps/+/HEAD/hterm/... [2] https://xkcd.com/927/ https://xkcd.com/927/