What is "snr"

Usage examples of "snr".

Willmu Keble Snr civitas, London, William Packer, Elizabeth Sewster, Marmaduke Walker, his mark, witness.

And Harry Snr, no longer imprisoned but once more master of the Mobius Continuum, had watched them do it and instructed them when they faltered.

But Harry Snr knew he could never take his son, or Brenda, back to the world where they were born.

Which is to say, what if Wingarde Pooley Snr is not the biological father of Wingarde Pooley Jnr?