Whiston produced one of the first isoclinic maps of southern England in 1719 and 1721.
From the en.wikipedia.org
Contour lines along which the dip measured at the Earth's surface is equal are referred to as isoclinic lines.
From the en.wikipedia.org
In population dynamics and in geomagnetics, the terms isocline and isoclinic line have specific meanings which are described below.
From the en.wikipedia.org
More examples
Isoclinal: having equal magnetic inclinations
In mathematics, specifically group theory, isoclinism is an equivalence relation on groups that is broader than isomorphism, that is, any two groups that are isomorphic are isoclinic, but two isoclinic groups may not be isomorphic. ...