In telecommunication, a longitudinal redundancy check (LRC) or horizontal redundancy check is a form of redundancy check that is applied independently to each of a parallel group of bit streams. The data must be divided into transmission blocks, to which the additional check data is added.
The term usually applies to a single parity bit per bit stream, calculated independently of all the other bit streams (BIP-8). although it could also be used to refer to a larger Hamming code.
This "extra" LRC word at the end of a block of data is very similar to checksum and CRC.
Read more about Longitudinal Redundancy Check: Optimal Rectangular Code, Pseudocode, C#, Java, C
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—Walter Savage Landor (1775–1864)