In Unicode, a script is a collection of letters and other written signs used to represent textual information in one or more writing systems. Some scripts support one and only one writing system and language, for example, Armenian.

The replacement character (often displayed as a black rhombus with a white question mark) is a symbol found in the Unicode standard at code point U+FFFD in the Specials table. It is used to indicate problems when a system is unable to render a stream of data to correct symbols.

computing industry standard for the consistent encoding, representation and handling of text expressed in most of the world's writing systems. Unicode is a standard, promoted by the Unicode Consortium, for encoding the text of most of the world's writing systems, using variable-width encodings, such as UTF-8.

To insert a Unicode character, type the character code, press ALT, and then press X. For example, to type a dollar symbol ($), type 0024, press ALT, and then press X. For more Unicode character codes, see Unicode character code charts by script.