FCs

FCS is an acronym that can refer to several terms across different fields. The specific meaning is usually determined by context, as with many initialisms used in science, technology, sports, and defense.

In computing and data communications, FCS stands for Frame Check Sequence, a sequence used for error detection in data transmission. The FCS typically involves a cyclic redundancy check (CRC) and is appended to frames in protocols such as Ethernet and PPP to verify data integrity.

In sports, FCS denotes the Football Championship Subdivision, the NCAA Division I football subdivision that participates in a postseason playoff system. It was formerly known as the I-AA division and is distinct from the Football Bowl Subdivision, which uses a different postseason format.

In military and defense contexts, FCS can refer to a Fire Control System, the processing and sensor suite that directs targeting and firing of weapons. It has also been used to describe the Future Combat Systems program, a U.S. Army modernization effort to develop networked, technology-enabled combat systems, which was ultimately terminated.

In biology and biotechnology, FCS is commonly used for fetal calf serum, a supplement derived from bovine fetuses used to support growth of cells in culture. While widely used, FCS is subject to variability and ethical considerations, leading many laboratories to seek alternatives.

Because FCS has multiple, domain-specific meanings, clarity in usage often requires accompanying context or definitions.