In the 7-bit ASCII character set, ASCII code 81 is represented by the character Q also known as the uppercase q.

Character Representation Value/Description
ASCII Character Q
Decimal 81
Octal 121
Hexadecimal 51
Binary 0101 0001
Description Uppercase Q
Category Printable Characters
Subcategory Uppercase Latin alphabet
Unicode U+0051

Encoding

Encoding non-standard letters and characters into values that can be displayed e.g. in browsers

Encoding Method Encoded Value
URL Escape Code Q
Quoted-printable =51