Hanko

In Japan they don't do signatures on legal documents. They have stamps called hanko. Japanese people get ones of their names, and it is generally written as their name in Kanji. They register their specific stamp with the local authorities, the nuances of their exact stamp are used verify that it is not a forgery. Foreigners are allowed to use their signature for most legal documents, but it is very difficult to sign things because they only give you the space that is generally used for the stamp, which is roughly the size of a thumb nail. They always use red ink, which still looks very exotic to me.