From Longman Business Dictionary
LBED_27_cpoint of saleˌpoint of ˈsale written abbreviation POS noun (plural points of sale) [countableC usually singular]MARKETINGCOMMERCE the place where a product is soldThe general sales tax is imposed only at the point of sale.
—point-of-sale adjectiveadj [only before a noun]point-of-sale credit card scanners
point-of-sale advertising
→ electronic point of sale