Maximum Securing Load (MSL)
Maximum securing load (MSL) is a term used to define the allowable load capacity for a device used to secure cargo to a ship. Safe working load (SWL) may be substituted for MSL for securing purposes, provided this is equal to or exceeds the strength defined by MSL.
Source: IMO MSC.1/Circ.1353, Revised Guidelines for the preparation of the Cargo Securing Manual, 30 June 2010, International Maritime Organization. Regulatory Guidance