ASCII, ISO and UTF

I struggle to remember what the ASCII, ISO and UTF acronyms stand for so I'm typing them up here in the hope that they stick!

• ASCII = American Standard Code for Information Interchange: this is the 7-bit character encoding system (7 bits so a total of 127 characters) and forms the basis of the other two systems.
• ISO = International Organisation for Standardisation: this is the 8-bit character encoding system which has a number of different versions each supporting a different set of languages (e.g. ISO-8859-1, ISO-8859-2 etc).
• UTF = Unicode Transformation Format: this is the system which uses a variable number of bytes (usually 1-4) to encode a character and hence supports a significantly larger number of characters than the other two systems.