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The 10k identifies the metal as 10 karat white or yellow gold. Ud is probably the jewelers mark such as Ultra Diamond.
14K is the percentage of gold in alloy. 24K is pure gold. UD stands for Unique Designs
UD means Unique Design
The Nissan UD Truck has a 6 ring piston. Minsei Diesel Industries are its manufacturers.
Ud=Ut dictum is a latin word, meaning "as directed"
Are you lost? (formal) Ud is an abbreviation for "usted" which is the formal singular word for "you"
"As Directed"
Ulcerative Dermatosis
Translation: Use "tu" when you speak to me, not "Ud.". (Literally: Speak to me of "tu" not of "Ud.".)
Fàcil (Easy), How are you?
I send the cards to you.
It means: "Do you have my pencil?"