(idiomatic) An entity that dominates its environment. / (idiomatic) Something dangerous, menacing, or frightening that is obvious but not addressed.

(athletics) A middle-distance running race over 800 metres.

An IEEE standard, IEEE 802.11e-2005, that adds QoS (Quality of Service) features and multimedia support to the existing 802.11b, 802.11g, and 802.11a wireless networks.

(telecommunications) An IEEE standard specifying security mechanisms for 802.11 networks. 802.11i makes use of the Advanced Encryption Standard (AES) block cipher. The standard also includes improvements in key management, user authentication through 802.1X and data integrity of headers.

plural of 800-pound gorilla

US standard spelling of 800 metres.

(CB radio slang) A bottle of beer.

plural of 807

(often with "the") Hawaii, after the 808 area code.

A Roland TR-808 drum machine / A synthetic drum or bass sound that emulates the sound of a Roland TR-808.