An island in Indonesia, located on the western coast of Sumatra. / A regency in North Sumatra, the capital is Gido. / The ethnolinguistic group from this island.

(organic chemistry) A white, crystalline, bitter substance.

That has been reflected (of light, sound etc.); undergoing reflection. / That reflects. / Having a component that reflects light. / Given to introspection; thoughtful, reflective.

Of or relating to Edward Tufte (born 1942), American statistician and pioneer in the field of data visualization.