What is ooo mean?

"OOO" is an abbreviation for "Out of Office." It is commonly used in email communications to indicate that the sender is currently away from work and will not be able to respond to emails promptly. Setting an OOO message is a professional way to inform colleagues and clients that you are currently unavailable and provide an alternative point of contact if necessary. The OOO message typically includes the duration of the absence and who to contact in the sender's absence.