As you said, the wheel is dharmacakra.
The kanji "竜" means "dragon" and is part of Ryuuji's name (竜=ryuu 士=ji).
The sanskrit symbol is used by the Japanese branch of the true cross order and isn't the letter "
Ta" from "
Tara" but the letter "
Ha" from "
Svaha" with an additional stroke on the right (sorry, I don't know how it's called) to make it a long vowel and a
chandrabindu to make a "m" sound at the end, so it reads "haam".
The sword is most likely koumaken, but it's just a supposition.
The symbol behind the sword is a lotus. In buddhism, the color of a lotus gives it meaning. But I'm not buddhist so I don't really know about those. You can look it up yourself.
The rest just looks like gibberish to me... Maybe that's a buddhist vase and some flames?