isogon

Noun

 * 1)  An equiangular polygon.
 * 2)  A line of equal or constant wind direction on a graph or chart, such as a weather map.
 * 3)  A line of equal or constant magnetic declination on a chart; an isogonic line.

Translations

 * Italian: isogona
 * Manx: co-uillin

Etymology
From.