It had ANSI escape sequences equivalent to CIRCLE or LINE like you'd find in microcomputer BASIC except the Gigi was much more colorful than any early micro.
The GiGi could run BASIC locally for one thing, although we never got to do it with the one that was connected a PDP-11 at the high school in Peterborough, NH. Instead we used BASIC-PLUS where you could print escape codes to do gfx.
This has now reached the masses with the sale of over 9000... I mean 800 PiDP-10 units. Oscar is kind of pushing ITS as the premier PDP-10 operating system.