$SPCX is arguably the perfect ticker symbol for SpaceX, but it's currently used by a near-bankrupt SPAC ETF under @TuttleCapital. TuttleCapital's executives are probably glued to their phones right now, hoping for a call from Elon Musk, just like Zuckerberg called @roundhill to acquire $META back in the day. It's a great way to land an irresistible takeover offer.
Of course, there are other options, like $X, $SPAX, or cool ticker symbols like $MARS, but honestly, in my opinion, $SPCX is the ticker symbol that best represents SpaceX.