If A stands for 5, B for 6, C for 7, D for 8 and so on, what do the numbers 22, 25, 8, 22 and 5 stand for?

The numbers spell RUDRA.

With A = 5, each letter equals its position + 4.

So a number n stands for the letter at position n - 4.

22, 25, 8, 22, 5 give positions 18, 21, 4, 18, 1.

These positions are R, U, D, R, A.