What is a 12 year period called?

What is a 12 year period called?
Numerical

Anniversary
Latin-derived term
Other terms

10 years
Denary
Tin Aluminum

11 years
Undecennial
Steel

12 years
Duodecennial
Silk

12 1⁄2 years

Parsley

Numerical
Anniversary Latin-derived term Other terms
10 years Denary Tin Aluminum
11 years Undecennial Steel
12 years Duodecennial Silk
12 1⁄2 years Parsley
See also  Diablo IV Has Gone Gold