There are different projects with "Beta" in their name. Depending on the context, people may be referring to one of these. To avoid further confusion, use their proper name.
- Beta Cluster, a small wiki farm running the latest alpha version of MediaWiki. See https://xx.xx.beta.wmflabs.org and the other wikis. Sometimes improperly called "Beta labs".
- Beta version, see Version#Beta version (versions of MediaWiki core, and of extensions)
- Beta Features, a section in user-preferences, created via Extension:BetaFeatures; a way for you to test new features on Wikimedia sites before they are released for everyone.
- Translatewiki.net, formerly known as Betawiki
- Beta apps, see Wikimedia Apps#Beta Testing
- Beta web, see Reading/Web#Beta/Alpha Features; the mobile site's opt-in beta (via Special:MobileOptions)