The article (about Arvind) says he had two sons, "Divakar ’01 and Prabhakar ’04" can somebody explain their names in this context?
So in this case, it means Divakar (graduate of MIT class of 2001) and Prabhakar (graduate of MIT class of 2004).
If instead they had earned a graduate degree, that would be indicated with some abbreviation for the granting school/college. (I don't know the MIT terms, but at Yale it could be SOM '01, MED '04, LAW '05, etc.)