In technical speak, a death cross is when the 50-day moving average dives below the 200-day moving average for a given chart. It’s seen as a VERY bearish sign.
Anyway, we’re about to see one in the well-known Reuters/Jeffries CRB index (a basket of commodities). Just a heads up.
Just for reference, here’s what the death cross looked like in Shanghai, which presages its huge dive.