A hidden message is information that is not immediately noticeable, and that must be discovered or uncovered and interpreted before it can be known.
Hidden messages include backwards audio messages, hidden visual messages and symbolic or cryptic codes such as a crossword or cipher.
Although there are many legitimate examples of hidden messages created with techniques such as backmasking and steganography, many so-called hidden messages are merely fanciful imaginings or apophany.
Here are ten that are hidden in famous logos of famous brands.