Answer

If you mean the 24 Tirthankars in Jain Dharma:

• R: Rishabhdev is the well-known Tirthankar name starting with R.
• T: There is no standard Tirthankar name in the 24 Tirthankars that starts with T.

Explanation

The 24 Tirthankars are commonly remembered by these names:

1. Rishabhdev
2. Ajitnath
3. Sambhavanath
4. Abhinandannath
5. Sumatinath
6. Padmaprabhu
7. Suparshvanath
8. Chandraprabhu
9. Suvidhinath
10. Sheetalnath
11. Shreyansanath
12. Vasupujya
13. Vimalnath
14. Anantnath
15. Dharmanath
16. Shantinath
17. Kunthunath
18. Aranath
19. Mallinath
20. Munisuvrat
21. Naminath
22. Neminath
23. Parshvanath
24. Mahavir

Spiritual Understanding

Remembering the names of the Tirthankars is a respectful way to stay connected with their teachings of:

• non-violence
• truth
• non-attachment
• self-discipline
• liberation

Takeaway

For R, the answer is Rishabhdev. For T, there is no Tirthankar name in the standard list of 24 Tirthankars.