RLL

RLL is an acronym that can refer to several different concepts depending on the context. Among the most common meanings are Run-Length Limited encoding used in data storage systems, and the right lower lobe of the lung in medical anatomy.

Run-Length Limited encoding: RLL encodes binary data into magnetic or optical signals by constraining the length of runs of zeros and/or ones. The (d,k) parameters specify the minimum and maximum number of consecutive identical bits allowed between transitions. By limiting long runs, RLL helps ensure timely clock recovery and constrains DC content, enabling reliable data transmission at high densities. Variants such as 1/7, 2/7, or 1/8 have been used in various storage technologies. In practice, RLL codes map input data into signal patterns that balance density with error resilience. RLL encoding has been employed in magnetic hard disk drives, magnetic tapes, and some optical storage formats, though many modern interfaces use alternative coding schemes.

Right Lower Lobe: In the medical field, RLL stands for the right lower lobe of the lung, one of the lung’s five lobes. It is situated in the lower portion of the right lung and is separated by the oblique fissure from the middle and upper lobes. Radiographic reports may reference findings in the RLL, such as pneumonia, atelectasis, edema, or mass. Clinical assessment of RLL pathology relies on imaging techniques like chest radiography and CT, combined with patient symptoms and history.

Context note: Because RLL is an acronym with multiple uses, its meaning is determined by the discipline and context in which it appears.