What does the special character “!” mean in PowerShell?

Question:

What does the special character ! mean in PowerShell?

Or a site which lists all special characters and meaning.
Example:

(Returns $false)

Answer:

PowerShell uses the ! character as an alias for the logical -not operator:

Source:

What does the special character “!” mean in PowerShell? by licensed under CC BY-SA | With most appropriate answer!

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