UO2peletter
UO2peletter is a fictional writing device and cryptographic concept that appears in speculative fiction and puzzle literature. In these works, the term describes a palm-sized tool capable of both producing legible text on surfaces and layering an embedded cipher that only authorized readers can decode. The name blends the chemical formula for uranium dioxide, UO2, with the coinage "peletter," a portmanteau of "pen" and "letter," underscoring its dual role as instrument and code.
In-world history, UO2peletter first enters circulation in mid-21st-century fiction as a revolutionary anti-forgery device. Designers describe
Technical portrayal varies by author, but common elements include mode-switching between readable text and encoded data,
Reception within fiction communities tends to view UO2peletter as a flexible plot device that blends typography
Related terms in the oeuvre include cipher pen, steganography, and cryptographic pen.