Abbreviation: VR = "Vibration Reduction" (Nikon)

The abbreviations means "Vibration Reduction"

Explanation from Nikon

This innovative VR system minimizes image blur caused by camera shake, and offers the equivalent of shooting at a shutter speed three stops (eight times) faster.* It allows handheld shooting at dusk, at night, and even in poorly lit interiors. The lens’ VR system also detects automatically when the photographer pans — no special mode is required. * As determined by Nikon performance tests.

See examples of effected products

Nikon AF-S 200-400mm f/4 G IF-ED VR II
Nikon AF-S 24-120mm f/4 G ED VR II
Nikon AF-S 600mm f/4 G ED VR

See links

nikonusa.com