Section 7 of the manual provides overviews on various topics, and describes conventions and protocols, character set standards, the standard filesystem layout, and miscellaneous other things.

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ascii
ASCII character set encoded in octal, decimal, and hexadecimal
iso-8859-5
iso_8859-5 - ISO 8859-5 character set encoded in octal, decimal, and hexadecimal
iso_8859-5
ISO 8859-5 character set encoded in octal, decimal, and hexadecimal
iso_8859_5
iso_8859-5 - ISO 8859-5 character set encoded in octal, decimal, and hexadecimal