POS is a short form for point of sale. POS hardware is basically used at trade or retail level, a checkout counter in a shop, or changeable sites where a deal occurs in this type of environment like restaurants, hotels, stadiums, casinos, as well as retail environments.

People often tend to compare CMMI with ISO 9001. The most common thing that I come to hear is that ISO 9001:2000 is same as CMMI Level 3. I am no expert on this but being an ISO 9001 organization which has started its journey for CMMI.