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c., circa (preposition)
Approximately, when referring to a date; literally, it means ""around" a certain date": The group started the program circa 2013 in Germany. .
This entry is located in the following unit: Archeology, Archaeology (page 2)
coulomb, C
An SI unit of electrical charge.

One coulomb is the quantity of electricity conveyed by a current of one ampere in one second.

This entry is located in the following unit: Measurements and Mathematics Terms (page 5)
degree, °C
Symbol for degrees Celsius; sometimes, called centigrade.
This entry is located in the following unit: Measurements and Mathematics Terms (page 5)