Anuradha means following Radha. The previous nakshatra, Vishakha, is sometimes called Radha, so this one is literally the star that comes after. Where Vishakha chases a goal, Anuradha builds the relationships that make anything worth reaching.
In Hindu mythology, Mitra is one of the Adityas and the god of friendship, contracts and the bonds that hold people together. His name is the ordinary word for friend in several Indian languages. What he governs is not warm feeling alone, it is the promise inside a friendship: the part you keep even when it costs you.
The lotus is the other symbol and it fits precisely. A lotus grows out of mud and does not become muddy. Anuradha natives often come through genuinely difficult circumstances without becoming bitter, which is the quality the symbol is pointing at.
Its shakti (the special power a nakshatra carries) is worship, or devotion. That covers bhakti in the religious sense and equally the ordinary devotion of staying beside somebody through a decade of difficulty.
Anuradha is known for friendship, loyalty and the ability to work with people across differences. Saturn rules it, which explains why the loyalty here is patient rather than sentimental. These natives hold a group together quietly and are usually the reason it has not fallen apart.