Shareef O'Neal is done at UCLA ... Shaq's son just announced he's transferring from the school after less than two years -- and it's unclear where his next stop will be.
"A part of my heart will always be at UCLA figuratively and literally," Shareef said in an emotional goodbye letter to the university. "I'm looking forward to the next chapter, wherever that may be."
Shareef came to UCLA in 2018 with sky-high expectations ... the 6-foot-9 forward was nationally ranked and had superstar potential.
But his freshman season ended before it began after UCLA doctors discovered an irregularity with his heart .