Abbreviation for 'carbon copies' in email, referring to additional recipients who receive a copy of the message. Also stands for cubic centimeters, a unit of volume measurement.
Originally from the practice of making carbon copies on typewriters using carbon paper. The abbreviation transferred to digital communication, maintaining the concept of sending copies to multiple recipients simultaneously.
The term 'cc' is a perfect example of technological metaphor persistence - we still use carbon copy language decades after carbon paper disappeared. Interestingly, 'bcc' (blind carbon copy) was invented for email and has no physical predecessor.
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