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?- atom_codes(hello, X). X = [104, 101, 108, 108, 111].
The‘listwards' call to atom_codes/2 can also be written (functionally) using backquotes instead:
?- Cs = `hello`. Cs = [104, 101, 108, 108, 111].
Backquoted strings can be mostly found in the body of DCG rules that process lists of character codes.
Note that this is the default interpretation for backquotes. It can be changed on a per-module basis by setting the value of the Prolog flag back_quotes.