what are od ad id
what are od ad id?
5 Answers
Do da di in reverse???
Odd advertisement identity?
objectivo directa y objectivo indirecta?
where did you see those letter combinations?
This is the techy side of me speaking (and the pedantic side too, which says we need more context, or, indeed, Any context)
A grammar guy might answer, just as alex did, as objectivo directa y objectivo indirecta.
In English however, those two come up together often, and are most usually written as I.D. and O.D. -- Inside Diameter and Outside diameter. Diámetro interior y diámetro exterior.