What is P/O as a prefix an abbreviation for?

Question

As in Lionel Roger Dorrien-Smith. Possibly Petty Officer?

If it is put in the prefix field it will of course be suppressed.

Answer 1

On Find A Grave it notes that he is a Pilot Officer, so I can only assume that this was someone's abbreviation for that rank.

Comments

Thepeerage.com also says pilot officer.

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He and  his two brothers died in WW2 and 2 members of the previous generation in WW1. They are recorded on a memorial in St Nicholas Church Tresco, Isles of Scilly http://www.iwm.org.uk/memorials/item/memorial/3553

Answer 2

"Parents of" im prety sure

Answer 3

Might it be some sort of military rank, e.g., Pilot Officer or Petty Officer? I have never seen either written as P/O with the slash though.