dired-omit-mode

dired-omit-mode is a variable defined in `dired-x.el'.
Its value is

nil

• Automatically becomes buffer-local when set.
• This variable is safe as a file local variable if its value
  satisfies the predicate `booleanp'.

Documentation:
Non-nil if Dired-Omit mode is enabled.
Use the command `dired-omit-mode' to change this variable.