In/Out the Two little Arrows,
was also used a long time ago, ( Incorrectly maybe? ) for clips that the Model Rises up from Behind the task Bar.
It was at that time used for any clip where the Model started off screen, and then comes in to the view.
and Also for clips where the Models exits the view going off screen.
Most of the Newer In/Out clips Involve the Model starting Behind a Blue Screen
then as she walks out from behind the screen, the camera catches her entrances.
the start of the Clip has a Hard Edge to it.
The Clips is thus, Shifted to the Side of your Monitor, so it appears that she enters from the edge of your Screen.
the Effect Looks great in Full Size,
but In FullScreen Scene's
It can look a bit odd, as Half a model starts out in thin air.
It gets a bit technical, but clip names, ( the Number ), are the Sum of a combination of bit values.
Bit value 64 is used for the In/Out clips.