Learn in the textbookExecutives and Their Roles
DefinitionCxO is a collective term (総称) for the titles of executives who hold top responsibility for the whole business or for an area such as finance or information.
ExplanationEach title takes the form Chief + area + Officer, and the letter standing for the area of responsibility goes where the x sits in CxO. For finance, F goes in to make CFO (Chief Financial Officer), and for running day-to-day operations, O goes in to make COO (Chief Operating Officer). Each company decides which of these posts to create, and no post is actually called CxO.
AnalogyIt works like the word captain in school teams. The football captain and the chess captain each lead their own team, and the word in front tells you which team the captain is in charge of.
Memory hookThe C at the start and the O at the end never change; only the middle swaps out. Read the middle letters and you know the area.