The most common shapes are called open-ended spanner and ring spanner. The term wrench is generally used for tools that turn non-fastening devices (e.g. tap wrench and pipe wrench), or may be used for a monkey wrench - an adjustable spanner. In North American English, wrench is the standard term.
The definition of first mate is the person on a boat that is second in charge after the captain. An example of first mate is the person who gives orders while the captain is busy. first mate. first mate.
It also refers to the officer in charge of the ship immediately under the authority of the captain and is responsible for all crew on deck and the safe operation of the ship. The first mate is also the watch officer, who's responsible for bridge operations and considered the primary pilot of the ship after the captain.