O12

O12 stands for:

• O12, ICD-10 code for pre-existing hypertension with grafted proteinuria during pregnancy, see list of diseases and conditions in pregnancy, childbirth and the puerperium according to ICD-10 # O10-O16
• O12, FAA code for Grand Lake St. Marys Seaplane Base in St. Marys, Ohio, United States
• O 12 class , a submarine class of the Dutch Navy, built from 1928 to 1932

This is a disambiguation page for differentiating between several terms identified with the same word.