For the traditional colleges of Columbia University at least, SCL means top 5% of class, MCL means top 15% of class - so it helps someone to easily put whatever 3.x GPA number in perspective. Junior Phi Beta Kappa (awarded in Fall) is even more selective.
The problem - no one will ever know if it were those greek and/or latin honors that did open a door somewhere, where majority of students typically have to wait a year or two before eventually being accepted - or if the same outcome would have happened anyway just based on GPA and strength of the application and interviews alone.
Just posted the honors breakdown in a different post - don’t want to break rules by duplicating: