Apparently "equality" is turning out to be the early favorite, but here's a list of the 29 officially okayed items:
Black Lives Matter; Say Their Names; Vote; I Can't Breathe; Justice; Peace; Equality; Freedom; Enough; Power to the People; Justice Now; Say Her Name; Sí Se Puede (Yes We Can); Liberation; See Us; Hear Us; Respect Us; Love Us; Listen; Listen to Us; Stand Up; Ally; Anti-Racist; I Am A Man; Speak Up; How Many More; Group Economics; Education Reform; and Mentor.
Emphasis mine, because yes, there's "education reform" on the list. It's not entirely clear what that means at this point, since much of what we used to call "reform" is now the education status quo (e.g. high stakes testing, some degraded version of "college and career ready" standards). So there's Education Reform, which is what we've been suffering under for a couple of decades, and there's education reform, which is the desire to get education out from under all the Education Reform we've been suffering under for a couple of decades.
But at least one player has reportedly adopted the slogan for his jersey--Boston Celtics forward Gordon Hayward. No idea why.