Sequence Elements
Escape sequences start with the character ESC (ASCII decimal 27/hex 0x1B/octal 033). For two character sequences, the second character is in the range ASCII 64 to 95 (@ to _). However, most of the sequences are more than two characters, and start with the characters ESC and [ (left bracket). This sequence is called CSI for Control Sequence Introducer (or Control Sequence Initiator). The final character of these sequences is in the range ASCII 64 to 126 (@ to ~).
There is a single-character CSI (155/0x9B/0233) as well. The ESC+ but the ESC+[ sequence is clearer.
Though some encodings use multiple bytes per character, the following discussion is restricted to ASCII characters, and so assumes each character is directly represented by a single byte.
Read more about this topic: ANSI Escape Code
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