What does dot in an XPath expression represent?

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Tags

1. #string
2. #number
3. #xpath
4. #because
5. #period
6. #element
7. #attribute
8. #refers
9. #expression
10. #atomic
11. #boolean
12. #character
13. #punctuation
14. #could
15. #value
16. #context
17. #called