The acronym “COB” frequently appears in email communication, particularly in professional settings. It typically stands for “Close of Business,” indicating a deadline or timeframe by which something needs to be completed. For example, a request might state, “Please submit the report by COB Friday,” meaning the report is due before the end of the standard workday on Friday.
Specifying a deadline using this term provides clarity and helps manage expectations regarding task completion. It avoids ambiguity associated with simply stating “by Friday,” which could be interpreted in various ways. Its widespread use reflects an emphasis on structured communication and efficient workflow management within organizations.