When and why to use {} in Appsheet

Hello guys, I'd like to know what is the use {} in Appsheet. I see it often in some examples, but I never read anything about it, neither have I seen anybody mentioning this in a video.

Take a look at the example below that I got in the appsheet documentation page:

TOP(LIST("Red", "Yellow", "Green"), 2) returns a list of 2 items: Red, Yellow

TOP({"Red", "Yellow", "Green"}, 4) returns a list of 3 items: Red, Yellow, Green

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