Micro-charge

From Memory Alpha, the free Star Trek reference.

Micro-charges were a type of explosive possessed by Ferengi merchant, Ulis, during the mid-22nd century.

When the Ferengi raiders who raided Enterprise in 2151 believed to have discovered the ship's vault, which was actually Sickbay's imaging scanner, it was suggested that they use micro-charges to blow it open, as a means of circumventing what they believed to be a magnetic seal. (ENT: "Acquisition")