SNL meaning in Military and Defence ?

Answer:

What is Standard Nomenclature List mean?

This is a historic (index) list of U.S. Army weapons and materiel, by their Standard Nomenclature List (SNL) group and individual designations — an alpha-numeric nomenclature system used in the U.S. Army Ordnance Corps Supply Catalogues used from about 1930 to about 1958. The July 1943 Ordnance Publications For Supply Index – OPSI – (page2) explains that the "Index of Standard Nomenclature Lists (...) covers – by groups, and subdivisions of groups – all classes of equipment and supplies, assigned to the Ordnance Department for procurement, storage, issue, and maintenance."
The designations in this Wikipedia list represent so-called "major items". For each of the major items, there were separate, designated "Standard Nomenclature Lists" — extensive parts catalogs for supply and repair purposes.

In essence, the index was a list of lists. There could be numerous volumes, changes, and updates under each single item designation.

According to the Corps' Ordnance Publications for Supply Index of July 1943:

Groups 'A' through 'N' covered "General Ordnance Supplies"; includinggroup 'F' (Fire control, and sighting material), andgroup 'G' (Tank / Automotive materiel)Groups 'P' through 'T' covered "Ammunition" – for which there was an additional AIC codeGroup 'Z' was for "Captured Enemy Material", andGroup 'OGS' indicated "Obsolete General Supplies".Group "Y", for 'Guided Missiles, guidance and control, launching, transporting, radio-controlled, and handling material, was added after July 1943 reference

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