Subaltern
（重定向自Subby）
A subaltern is a primarily British military term for a junior officer. Literally meaning "subordinate", subaltern is used to describe commissioned officers below the rank of captain and generally comprises the various grades of lieutenant.
Ensign stands for standard or standard-bearer and was, therefore, the rank given to the junior officer who carried, or was responsible for, the flag in battle. This rank has generally been replaced in Army ranks by Second lieutenant. Ensigns were generally the lowest ranking commissioned officer, except where the rank of subaltern itself existed.