What does TN 316 mean stamped on a ring?

The stamp "TN 316" on a ring typically indicates that the ring is made from 316 stainless steel, a high-quality alloy known for its corrosion resistance and durability. The "TN" could refer to the manufacturer or designer's initials or brand name. This type of stainless steel is commonly used in jewelry, particularly for its ability to withstand exposure to moisture and sweat.