where could i have found this in documentation?

Any ASCII table. And as for them not seeming to be in any order, I think it's actually quite orderly, so long as you stay in octal:

In reply to Re^3: Obfuscation or printing words like \160\162\151\156\164 by jhourcle
in thread Obfuscation or printing words like \160\162\151\156\164 by jbrugger

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