Alpha romeo, over and out

S&P Inclusion Of Tesla At All-Time-Highs Zaps The Stock Of Its Alpha-Generating Power

Alpha, the measured, and stable mean surplus.  

An index is designed to isolate out the latter of the Greek letters. In math, Greek letters are the things we always want to get rid of. If you solve an ancient Greek paradox or conjecture then you get to dump a boatload of Greek letters. But Alpha remains, the one beloved of the Greek letters, and easy on the ear.