RFC 2978:IANA Charset Registration Procedures
RFC-Ref

One-to-One


Click on the red underlined text to get to the source

... US-ASCII and ISO-8859-1 which consist of a small set of characters and a simple one-to-one mapping from single octets to single characters. Multi-octet character encoding ...
... A Coded Character Set (CCS) is a one-to-one mapping from a set of abstract characters to a set of integers. Examples of coded character sets ...



Google
Web
RFC-Ref