U+0005 "ENQ" ENQUIRY Unicode Character

U+0005 "ENQ" ENQUIRY is a control character originally defined in the ASCII standard for data transmission, used to request a response from a remote station or device. It belongs to the C0 control code set and is typically sent by a master station to ask a slave station if it is ready to receive data or to confirm its identity. Historically, ENQ was part of communication protocols in teletypewriters and early computer networks, functioning as a handshake signal that expected an acknowledge (ACK) or negative acknowledge (NAK) reply. Today, it is rarely used in modern computing, though it remains defined in Unicode for the sake of compatibility with legacy systems and data formats.