Newbie question from a 4 yr member.

[Caged Billie]

My apologies if this is a very simple answer, but can someone clarify this for me please.
What is the purpose of the double square icon beside the X over the individual photos in the gallery?

 

[Downfor]

To view comments on the photo.

 

[Caged Billie]

To view comments on the photo.

Thank you Downfor.
That was embarrassingly obvious now.