Fortnite meaning of this sign?

Sl
3

Hi, when I was playing Fortnite again, I came across this sign (marked in green)

Fortnite meaning of this sign

But what does this mean?

oa

Rune then sometime the volcano explodes and so on

sl

Reminds me of the Atari logo

ig

It belongs to an event. Just do not notice that.

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