Abbreviation: SIC = "Super Integrated Coating" (Nikon)

The abbreviations means "Super Integrated Coating"

Explanation from Nikon

To enhance the performance of its optical lens elements, Nikon employs an exclusive multilayer lens coating that helps reduce ghost and flare to a negligible level. Nikon Super Integrated Coating achieves a number of objectives, including minimized reflection in the wider wavelength range and superior color balance and reproduction. Nikon Super Integrated Coating is especially effective for lenses with a large number of elements, like our Zoom-NIKKOR lenses. Also, Nikonīs multilayer coating process is tailored to the design of each particular lens. The number of coatings applied to each lens element is carefully calculated to match the lens type and glass used, and also to assure the uniform color balance that characterizes NIKKOR lenses. This results in lenses that meet much higher standards than the rest of the industry.

See links

nikonusa.com