Dunno if it's "In or Out" but wikipedia calls it "motor cue"none said:
Looking at RotJ newscasts found the first of the cue markers for that film:
Odd that newscasts would have been given a telecine of an actual 35mm print. The scene is where Leia and Luke jump onto the speeder bikes pursuing the escaping Scout Troopers. About 53:00-56:00 minutes in. (dependent upon version) Unsure if this pic is from the In or Out marker section.
Then extrapolating with PAL GOUT frame numbers:
83176 - 83179 .............. motor cue
83180 - 83347 .............. (168 frames)
83348 - 83351 .............. changeover cue
83352 - 83375 .............. ( 24 frames)
83376 - ..............next reel. I have foreseen it in Post_3 :)
83178