The Enquiry character (␅) is a control character in the ASCII and Unicode character sets with the value of 5. It is often abbreviated as ENQ. The Enquiry character was originally used in telecommunications to request a response from a remote station. It effectively acts as a signal to the other system asking it to respond and confirm that it's ready and available to accept commands or data.
Here are some key details:
- In ASCII and Unicode, the ENQ character is defined as U+0005.
- In some protocols, the receiving station would respond with an Acknowledge (ACK) character to indicate that it's successfully received the ENQ and is ready to proceed.
- Like other ASCII control characters, ENQ does not represent a printable glyph and is typically non-visible in text content.
- While the use of such control characters is less common in modern computing and telecommunications due to the evolution of more complex protocols, it may still be used in some contexts or legacy systems.
As with many control characters, the exact interpretation and usage can depend on the specific system or protocol being used.