The Flash Season 2 Episode 13 plot has Barry, Cisco, and Harry enter the final portal to Earth 2 through the "speed cannon". While in the speed force, they see "everything" according to Jay Garrick. This proves some fan theories and shows some cool cameos. These images are following:

1) We see Earth 2 Green Arrow with a new bow and some cool armor.

2) We see a thicker, adult version of the Flash.

3) We see a ring with an L and a comet as the logo... not sure what this represents.

4) Gorilla Grodd with red eyes looking mad.

5) Jonah Hex for sure.

6) Supergirl is from Earth 2??? Or maybe he is seeing different Earths?

Anyways, just wanted to post those images and find out what the object from picture 3 could represent.

Edit: Legion of Superheroes DC weak my bad.