Commodore is a naval rank used in many navies that is superior to a navy captain, but below a rear admiral. Non-English-speaking nations often use the rank of flotilla admiral or counter admiral or senior captain as an equivalent, although counter admiral may also correspond to rear admiral. It is often regarded as a one-star rank with a NATO code of OF-6 (which is known in the U.S. as "rear admiral (lower half)"), but whether it is regarded as a flag rank varies between countries.