What pattern or effect is this?

I'm trying to figuring out how to create this pattern:

I've checked illustrators own library/swatches didn't find anything.

Ive played in the effect gallery, still didnt get the same effect.

Maybe someone knows this pattern or effect?

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Legend

Locking this thread as it is a duplicate thread.

-OM

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This is a duplicate post with a different title.

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