Blocked user is a registered or anonymous user of a wiki-project, who was blocked for some time by any administrator. Administrators often block violators of the rules of project (e.g. vandals), but a user can be also blocked by his own request or by administrator's mistake..
Users can be blocked for a space of time or sometimes indefinitely.
blocked user — bot — anonymous — user — ipblock-exempt — rollbacker — autopatrolled — uploader — patroller — importer — sysop — bureaucrat — oversight — checkuser — steward — developer — dictator / founder