micri is an archaic non-SI decimal metric prefix for 10−14. Its symbol was mc.
The name micri-erg was proposed in 1922 by William Draper Harkins as a unit of energy equating to 10−14 erg, the equivalent to 10−21 joule. This was proposed as a way to measure the surface energy of molecules in surface chemistry.
References
Micri- Wikipedia(Text) CC BY-SA