What does the “#” symbol in a UML class diagram mean?

Question

I read the Algorithms in a nutshell (O'Reilly) and came across this symbol in the class diagram. I suppose this means the element is protected, but I wanted to know if anyone knows what this means.

Answer 1

Indicates a protected member of a class or other data type.

- Indicates closed

+ Indicates publicly available

# Indicates protected

Answer 2

'#' indicates visibility. In this case, this refers to a protected operation [the term “method” has been edited, since this is not general).

Answer 3

This means that it is protected; for a variable, it will be displayed only in the class and inherited classes.

Answer 4

Add also:

~ Indicates package-private (or default)

Answer 5

'#' means the visibility of the “protected” (similar to public, private) behavior of the property / methods in the class. You can find more of the same at uml_basic_notations