Pin1are
Pin1are is a fictional element introduced in the "Star Trek: The Next Generation" episode "The Masterpiece Society." In the context of the series, it is described as a rare and highly unstable isotope of a noble gas. Its unique properties made it essential for the creation of the advanced "Borg-Proof" shields developed by the Masterpiece Society on the planet Minos. These shields were designed to resist Borg assimilation technology.
The instability of Pin1are meant that it decayed rapidly, requiring precise and immediate application once synthesized.