Different encoding systems for "Hello" example:

ANSI
48 65 6C 6C 6F

Unicode (little-endian) encoding with no BOM.
48 00 65 00 6C 00 6C 00 6F 00

Unicode (little-endian) encoding with BOM
FF FE 48 00 65 00 6C 00 6C 00 6F 00

Unicode (big-endian) encoding with no BOM
00 48 00 65 00 6C 00 6C 00 6F

Unicode (big-endian) encoding with BOM
FE FF 00 48 00 65 00 6C 00 6C 00 6F

UTF-8 encoding
EF BB BF 48 65 6C 6C 6F

UTF-7 encoding
2B 2F 76 38 2D 48 65 6C 6C 6F



Reference:
http://blogs.msdn.com/b/oldnewthing/archive/2004/03/24/95235.aspx