Secant line a circle in the Euclidean plane, a line joining two of them would be a 2-secant (or "bisecant") and a line passing through only one of them would be a 1-secant (or "unisecant"). A unisecant in this example need not be a tangent line to the circle. This terminology is often used in incidence geometry and discrete geometry. For instance, the Sylvester–Gallai theorem of incidence geometry states that if points of Euclidean geometry are not collinear then there must exist a 2-secant of them. And the original orchard-planting problem of discrete geometry asks for a bound on the number of
All that glitters is not gold Portia's boxes (Act II - Scene VII - Prince of Morocco): Panning for gold often results in finding pyrite, nicknamed fool's gold, which reflects substantially more light than authentic gold does. Gold in its raw form appears dull and lusterless. The original version of the saying used the word "glisters", but "glitters" long ago became the predominant form. Poet John Dryden used "glitter" in his 1687 poem "The Hind and the Panther". The words "glister" and "glitter" have the same meaning. In pop culture, this phrase shows up in Bob Marley's "Get Up, Stand Up". It is also used as