This emoji was inspired by the 'outbox' tray in an office. In the digital age, it's mainly used to mean a successful transmission of an email or file, and it can also be a symbol of a 'completed task.'

It goes beyond simply stating 'sent' and can carry the nuance of 'it's out of my hands' or 'my part is done.' This makes it useful for expressing relief after submitting an assignment or sending important documents. As the opposite of the inbox tray (📥), it's a fun emoji that visually shows the flow of information.