Abbreviation: SWM = "Silent Wave Motor" (Nikon)

The abbreviations means "Silent Wave Motor"

Explanation from Nikon

Nikon´s AF-S technology is yet another reason professional photographers like NIKKOR telephoto lenses. AF-S NIKKOR lenses feature Nikon’s SWM which converts “traveling waves” into rotational energy to focus the optics. This enables high-speed autofocusing that’s extremely accurate and super quiet.

See examples of effected products

Nikon AF-S 50mm f/1,4 G
Nikon AF-S 200mm f/2 G ED VR II
Nikon AF-S DX 16-85mm f/3,5-5,6 G ED VR

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