.onion. Format[edit] The "onion" name refers to onion routing, the technique used by Tor to achieve a degree of anonymity.
WWW to .onion Gateways[edit] Proxies into the Tor network like Tor2web, onion.to and onion.lu allow access to hidden services from non-Tor browsers and for search engines that are not Tor-aware. /r/onions: Top Tor Sites.