This stands for Logical Record Length, and prior to MVS/ESA 4.3 the LRECL parameter had to be coded as a sub-parameter of DCB, as in DCB=(LRECL=nnnnn. LRECL has subsequently been propogated to full parameter status, and does not need to be part of the DCB sub-parameter list.
The JCL coder has very little control over the Logical Record Length, as it must relate to the record descriptions held in the program.
If a data set is being processed in input mode, it is best to omit the LRECL from the DD statement, allowing the system to determine the length from the program or file label.
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