Lord Krishna in Dyanam
These are various gayatri mantras to the Lord and His different expansions for particular purposes.
Aum Devkinandanaye Vidmahe
Tanno Krishnah Prachodayat.
Meaning for Krishna Mantra:
“Om. Let us meditate on Sri Krishna, beloved son of Devaki and Vasudeva. May that Lord Krishna of dark complexion, who steals the heart, inspire and illumine our mind and understanding.”