Unicode Transformation Format [8-bit] (UTF-8) ...

UTF-8 is a variable length character encoding method for Unicode.. It is otherwise known as 8-bit UCS/Unicode Transformation Format.

UTF-16 is another variable length character encoding method for Unicode, that is a stronger then UTF-8. It is otherwise known as 16 bit Unicode Transformation Method.

View -> Encoding -> Unicode -> UTF-8

UTF-8 codes are easy to input. For example, "U+0064" could be input by holding the ALT key and entering "0064" on the numpad.

Note that UTF-8 0064 is the same as ASCII 064 and will produce a @ sign.

In ASCII and UTF-8, the character 'a' has the 8-bit biary code 01100001 (which is 97 in decimal).

Full lists of character codes can be obtained from several websites (just search for things like "character codes", "ASCII", "UTF-8", "UTF-16", "Unicode" and so on).