aski fu'ivla

characters x1 (ordered set of numerals) represents non-encoded x2 (text) in ASCII

ASCII is The American Standard Code for Information Interchange is a character-encoding scheme. See iunkoda

In notes:

characters x1 (ordered set of numbers) represent non-encoded x2 (text) in Unicode according to encoding rules x3
x1 (text) is a krakozyabry, mojibake, illegible, corrupt symbol or text, usually caused by mismatched encoding