What does square brackets mean in math?

Related questions

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4. Why are square brackets used in quotes?
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6. Does square bracket mean included?
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Tags

1. #round
2. #group
3. #brackets
4. #symbols
5. #curly
6. #things
7. #braces
8. #types
9. #pairs
10. #parentheses
11. #together
12. #square
13. #include