Use the sign pointing when you refer to something. It doesn’t have to be based on a literally physical object in sight.

Singular Pointing Affix = refers to something spatially that is singular 

Plural Pointing Affix = refers to something spatially that is plural 

Singular Pointing Affix Examples
The person wants to see you.
Do you want the food?

Plural Pointing Affix Examples
The TVs are mine. 
The dogs need food. ​