18-yr.-old high schoolers, usually

• Upperclassmen: Abbr.
• Most Soc. Sec. recipients
• Some pops: Abbr.
• Promgoers, often: abbr
• They often get rings: Abbr.
• Last year's jrs
• Some SAT takers: Abbr
• H.S. class
• Coll. grads-to-be

Wikipedia Word definitions in Wikipedia
Svenskt Respitsystem ( SRS ), formerly known as Leading Yard Stick and Lidingö Yard Stick ( LYS ). SRS is an empirically based handicapping system used in yacht racing in the Nordic countries . The handicap system was developed in 1970 by the Swedish yacht ...