Impediment is the punctuation mark…
The impediment is actually not a punctuation mark, it's finally three dots, so it's actually three punctuation marks. The impediment is also known as a processing point. In the spoken language it is also called Panahi to indicate these three dots. Both before and after the character must be a space, except if it comes after a hyphenated word. At the end of a sentence there is not an extra point, so 3 dots remain 3 dots.