Check out this concept Encoder Ring, where binary numbers (0s and 1s) are used to store up to 66 characters.
It’s a cool concept, now I wish they made Encoder Rings in titanium or at least sterling silver.
Encoder Rings began as an investigation in how to store precious or personal digital information. The result is
a series of rings that are decorated with tiny blobs and holes, that actually represent letters in binary code; the
code used as the basis for digital information. The user would choose a secret message 64 characters long,
have the message translated into binary code and finally have a ring produced using rapid-prototyping.