Originally Posted by Chibii
Played in All Queues: achieved a tier in 5v5 solo, 5v5 team, and 3v3 team
Special summoner icon based on the lowest tier achieved in the three queues
So is this special summoner icon separate from the other rewards?
Yes, this is a special icon just for players who have played in all three queues: Ranked Solo, Ranked 3s, and Ranked 5s. If you were Gold in all three, you'd get a Gold icon, but if you were Gold in two of the queues and Bronze in the third, you'd only get a Bronze icon here.