5C

5C can be used to describe several items including:

*Five Company (5C) Digital Transmission Content Protection
*CAL Cargo Air Lines IATA code
*Fifth Cambridge Survey of Radio Sources
*5-C (Five County), an Idaho juvenile detention center for high-risk individuals
*A type of United States security clearance

*5c can mean 5 cents in monetary value, especially on stamps
*5C is the commonly used abbreviation of "Chromosome Conformation Capture Carbon Copy", or 3C-Carbon Copy: a high-throughput genomic technology, based on 3C (Chromosome Conformation Capture) to detect interactions between genomic loci (Genome Res. (2006), 16 (10): 1299-1309).