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.
Officer in charge is just a general term used to describe the officer who has authority over a specific situation. It can refer to many thing - an officer in charge of a specific criminal or traffic case, the officer who is in charge of a division's station house at a specific point in time, or even a command officer in charge of a specific event. This term does not reflect or describe any one specific rank.