[MysticCat]

^^ That's what we would do with individuals, except we would use chapter designation (without school or with school in parentheses) and year of initiation, not graduation. E.g., Andy Griffith, Alpha Rho 1946.

But that's different from what the OP described and from what 33girl reacted to. They're not talking about describing an individual after he or she graduates; they're talking about a designation for a pledge/new member class -- specifically, designating the class by the year its members will graduate (which assumes they are all the same year and will graduate at the same time). In other words, this fall's pledge/new member class would be referred to as the pledge/new member class of 2015. That presumes all members of the class are freshman and will graduate in four years.

We don't have a standard for that. In my experience, most of our chapters will either designate probationary member classes by the season and year of pledging (e.g., the Spring 2012 class) or by Greek letters (e.g., the Gamma PM class, meaning the third in the chapter's history).