House 11 concerns the future and collective ties: friendships, networks, projects, ideals, aspirations — everything built with others rather than alone, extending the personal success of House 10 that precedes it.
A planet in House 11 often influences your relationship to groups and causes larger than yourself, or the way you form lasting friendships.
Succedent house (with Houses 2, 5, and 8): associated in classical doctrine with stability — House 11 consolidates over time what the angle of the Midheaven (House 10) set in motion: a public achievement extends into a network of support.
Natural sign and ruler: Aquarius, ruler Saturn (Uranus in modern astrology) — consistent with the theme: Aquarius is itself the sign of collective ideals and social innovation. See the Aquarius entry.
Planetary joy: Jupiter finds its joy in House 11 (Hellenistic doctrine) — hope, expansion, and the support of friends are considered naturally favorable ground there for this planet.