Just a link today to this brief history of punctuation. Punctuation comes from the Latin for point or prick. The verb was pungere, but the little hole made was a punctum (it's a little complicated, more here). Thus the little dots in text were, in Medieval times, called punctuation. Somebody concerned with fine points of behaviour is punctilious. And if you arrive at exactly the point you were meant to, you are punctual. Somebody who doesn't feel the little pricks of conscience when he sticks a knife into your car's tyres has no compunction about puncturing.
And somebody who punctures your body without compunction is practicing acupuncture.
The Inky Fool trying to cure his pins and needles