ASCII

Usage

0x01 | 001 | A | | TC | ␁ | SOH: Start Of Heading
0x02 | 002 | B | | TC | ␂ | STX: Start of TeXt
0x03 | 003 | C | | TC | ␃ | ETX: End of TeXt; Used to end strings in some languages, such as for labels in HP-GL

0x05 | 005 | E | | TC | ␅ | ENQ: Enquire; Used for ‘Enquire/Acknowledge’ handshake mode of RS-232C
0x06 | 006 | F | | TC | ␆ | ACK: Acknowledge
0x07 | 007 | G | \a | OT | ␇ | Bell: Bell (audible or visual attention indicator)

0x08 | 008 | H | \b | FE | ␈ | BS: BackSpace
0x09 | 009 | I | \t | FE | ␉ | HT: Horizontal Tab; sometimes used as a reverse half-space (i.e. half-backspace)
0x0A | 010 | J | \n | FE | ␊ | LF: Line Feed; Sometimes used as an ‘echo terminate’ character
0x0B | 011 | K | \v | FE | ␋ | VT: Vertical Tab; sometimes used as an ‘inverse line feed’
0x0C | 012 | L | \f | FE | ␌ | FF: Form Feed
0x0D | 013 | M | \r | FE | ␍ | CR: Carriage Return

0x0E | 014 | N | | LS | ␎ | SO: Shift Out; Sometimes used to select an alternate character set
0x0F | 015 | O | | LS | ␏ | SI: Shift In; Sometimes used to select the standard character set
0x10 | 016 | P | | TC | ␐ | DLE: Data Link Enable

0x11 | 017 | Q | | DC | ␑ | DC1: Device Control One; ‘Xon trigger’ in many ‘Xon/Xoff’ handshaking schemes
0x12 | 018 | R | | DC | ␒ | DC2: DC1 and DC2 generally involve activating a device
0x13 | 019 | S | | DC | ␓ | DC3: ‘Immediate response’ string for some handshaking schemes; ‘Xoff trigger’ in others
0x14 | 020 | T | | DC | ␔ | DC4: DC3 and DC4 generally involve pausing or turning off a device

0x16 | 022 | V | | TC | ␖ | SYN: SYNchronous idle
0x17 | 023 | W | | TC | ␗ | ETB: End of Transmission Block
0x18 | 024 | X | | OT | ␘ | CAN: CANcel
0x19 | 025 | Y | | OT | ␙ | EM: End of Medium
0x1A | 026 | Z | | OT | ␚ | SUB: SUBstitute; Often used as an End of file indicator; Sometimes used as a data padding character

0x20 | 032 | | | FE | ␠ | SP: SPace; Not ‘technically’ a control character, but it is non-printing in much the same was as HT