The firm also announced that its chief operating officer (COO) Don Morrison is planning to retire.

BBC: Blackberry maker RIM to cut 2,000 jobs in shake-up

Inc. (NASDAQ: YHOO) announced today that Henrique de Castro has been hired as chief operating officer (COO).

ENGADGET: Yahoo hires Google exec Henrique de Castro as COO

Five years later he was named chief operating officer (COO).

FORBES: Magazine Article

Many a CFO (chief financial officer) or COO (chief operating officer) falls squarely in this category.

FORBES: Is The End Of Gigantic, Unfair, And Absurd CEO Pay Near?

Sandberg's appointment as chief operating officer at Facebook comes a month after the company announced that Owen Van Natta, its chief revenue officer and former COO, would be leaving.

FORBES: Google Loses Top Exec To Facebook