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Lord Visnu is an expansion of Lord Krishna and has four arms holding His club, conch shell, sudarsana chakra and a flower. Lord Visnu is worshiped by His devotees in the Vaikuntha planets. Here in the material world Lord Visnu has entered as Maha Visnu and is the collective Supersoul within the hearts of all living entities. So when yogis meditate the subject matter of their meditation is Lord Visnu within their hearts and the perfection of yoga is to see Lord Visnu.