POP stands for Point of Purchase
On the YESPOS website, these terms are used interchangably to describe in-store cardboard display materials. These are used in a number of industries to promote and arrange products in store, or to display promotional literature. As a generalisation POS is usually used to describe 2D items and POP is 3D. However, to make things a bit more confusing, the term POS (or EPOS) can also be used to describe electronic point of sale equipment used for electronic tills and billing systems. On this site, however, we are always refering to cardboard promotional materials.