arrows beside some channel on guide screen

[Sasquatch]

Hi I'm new to this. I noticed that arrows (>)  appear beside some channels on the guide screen, what is this? The guy who installed my cable didn't explain it to me.

[xray]

The < arrow on a program indicates the start time of the program is in the time slot to the left which is currently off screen.

[BenoitYVR]

It's the indicator telling you that you can restart the show from the beging.

[Esporey]

You can use that when you are looking for future programming.