Some numbers are believed by some to be auspicious or lucky or inauspicious or unlucky based on the Chinese word that the number sounds similar to. The numbers 6 and 8 are widely considered to be luck
Numbers 4, 13 and 14 are omitted in some Chinese buildings.
"Double happiness" ring design
Official Las Vegas Light Bulb #88 from 08-08-08
666 is the natural number following 665 and preceding 667.
666 is often associated with Satan, who is illustrated here in an engraved interpretation by Gustave Doré.
A 666 float in a Paris street parade