Not a zero, as Jansy said.  Dolinin relates it to various things.
Was it someone here who said that if the third call was the same
mistake, it would make 666?

I said that, in Dec. 2004, and pointed out that Christianly it is the number of the Beast, the Antichrist, death, etc. etc. But I also pointed out that Jewishly, by Gematria, three 6s make 18, which is life ([chet=8] + [yud=10]). So that as a symbol or sign the three 6s are completely ambiguous.

 

Anthony Stadlen