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

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In notes:

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