From this link,Taddha tadvanam nama tadvanam iti upasitavyam (Kena Upanishad)
Meaning-"That is Adorable(Tadvanam); one should meditate on It as 'Adorable'." This is one Upanishadic meditation, in the Kena Upanishad. Brahman is the most adorable and we should conceive Brahman as the most adorable and you will become the most adorable in the world.
So,is "Tadvanam" a name for Brahman who is beyond description and by this name can we worship the Brahman like we worship other deities?.