Downed symbol
They are different.
The downed player is the little inverted triangle, and the defeated player is the blue skull and cross bones in the black circle.
i believe they’re referring to the one hovering over the person, and i agree, knowing who is down versus who is dead makes a huge difference when you’re using a revive skill in a high damage zone. just today i was in TA and the poison clouds covered most of the ground so i only saw the icons of 2 people on one side and 1 person on the other, i couldn’t see their bodies under the clouds so i chose to rez the 2 people but they were both defeated and the other one died in the process. very frustrating for making fast decisions. one huge difference for wvw is there’s not always the party icons to see everyone’s health.