Swami gimmick

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A swami gimmick is a prop used in magic and mentalism. It enables its user to create the illusion of knowing something in advance under impossible conditions (precognition), or of being able to read the thoughts of another person (telepathy). It is also known as a "nail writer". It is any device used to covertly write information down for the purpose of creating the illusion of precognition or telepathy. They are commonly available from magic shops, and often consist of a small pencil lead held in a clear plastic sleeve that can be fitted over the thumb.