Marvel Rating System

History
Due to Marvel's turning againist CCA, they adopted the Mavel Rating System. It started out in 2001 as:

• All Ages
• PG
• PG+
• Parental Advisory / Explicit Content

The Motion Picture Association of America got mad as they hold the copyright for the term "PG rating". So, Marvel changed it to:

• All Ages
• PSR (Parental Supervision Recommended)
• PSR+
• Parently Advisory / Explicit Content

However, in 2005, they switched to a new version of it:

• All Ages
• A: Apporiate for age 9 and up
• T+: Teens and up
• Parental Advisory
• Max: Explicit Content

References:
http://en.wikipedia.org/wiki/Marvel_Rating_Systam