Just a lower case “d”. In america anyway. I’m ignorant of england and canada.
Also, in america, it represented weight....as in nails at a hardware store.
nails: 10d, 8d, 6d,...etc
That would be read as ten penny nails, 8 penny nails, 6 penny nails. It indicates how much each nail weighed.
Very interesting. Thank you!
Postings from Thon taken down?