dired-omit-files

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

"^\\.?#\\|^\\.$\\|^\\.\\.$"

Documentation:
Filenames matching this regexp will not be displayed.
This only has effect when `dired-omit-mode' is t. See interactive function
`dired-omit-mode' (M-x dired-omit-mode) and variable
`dired-omit-extensions'. The default is to omit `.', `..', auto-save
files and lock files.

You can customize this variable.