on (one's) person
In one's possession. He always had an umbrella on his person, even on sunny days.
on one's person
[of something] carried with one. Always carry identification on your person. I'm sorry, I don't have any money on my person.
about/on your ˈperson
(formal or humorous) carried with you, for example in a pocket or bag: You don’t happen to have a pen about your person, do you?