NEW 24/5 trading

Updating some watch lists and I noticed a new little symbol next to a few of them. A little “24” inside a circle. Apparently it means these are now available for 24/5 trading similar to futures. No idea when it starts or what the deal is…

The symbols I’m seeing so far:

EEM, FXI, GLD, IWM, QQQ, SPY, TLT, UNG