Short for Entertainment Software Rating Board, ESRB is a rating system that helps enable parents and others choose games that are most appropriate for their children. Below is a listing of some of the ESRB rating symbols that you are most likely going to see on a software product and a description for each of these ratings. The picture is an example of the Sims 3 expansion pack "Ambitions" and an example of the ESRB Teen rating in the bottom left corner of the box.
Short for Early Childhood, EC games are best fit for children under the age of 3.
Short for Everyone, E games are games that are good for all ages of people.
Short for Teen, T games are games that are best for persons over the age of 13.
Short for Mature, M games are best for persons over the age of 17.
Short for Adults Only, AO games are games that are best for persons over the age of 18.
Short for Rating Pending, RP is games that have a rating that is still under investigation.