The phrase "little arrow" refers to a small, pointed symbol that typically appears on computer screens or maps to indicate direction or movement. Full definition
I put lots of little arrows on this pic because it's kinda hard to see since there's so much white going on. (realitydaydream.com)
As you can see in the movie poster below I added little arrows in pointing to the toys that I am going to share with you! (happeningsoftheharperhousehold.net)
Instead, you have to tap tiny little arrows to the left and right of your content. (gizmodo.com)