One approach to working with ideographic character sets is to convert all characters to a wide character encoding scheme such as Unicode. Unicode characters and strings are also called wide characters and wide character strings. In the Unicode character set, each character is represented by two bytes. Thus a Unicode string is a sequence not of individual bytes but of two-byte words. 

The first 256 Unicode characters map to the ANSI character set. The Windows operating system supports Unicode (UCS-2). The Linux operating system supports UCS-4, a superset of UCS-2. Delphi supports UCS-2 on both platforms. Because wide characters are two bytes instead of one, the character set can represent many more different characters. 

Using a wide character encoding scheme has the advantage that you can make many of the usual assumptions about strings that do not work for MBCS systems. There is a direct relationship between the number of bytes in the string and the number of characters in the string. You do not need to worry about cutting characters in half or mistaking the second half of a character for the start of a different character. 

The biggest disadvantage of working with wide characters is that Windows supports a few wide character API function calls. Because of this, the VCL components represent all string values as single byte or MBCS strings. Translating between the wide character system and the MBCS system every time you set a string property or read its value would require additional code and slow your application down. However, you may want to translate into wide characters for some special string processing algorithms that need to take advantage of the 1:1 mapping between characters and WideChars.