0x03
0x03 is the hexadecimal notation for the integer value 3. In most programming languages, the prefix 0x indicates a base-16 number, so 0x03 equals the decimal 3. In binary, it is represented as 00000011 in an 8-bit form.
In ASCII and Unicode, the code point U+0003 corresponds to the End of Text (ETX) control character.
As a bitmask or flag, 0x03 represents the two least significant bits set (bits 0 and 1).
In some binary protocols or file formats, 0x03 may appear as a type indicator or length field,
Because 0x03 is a non-printable control character in ASCII, it typically does not produce a visible glyph