I came across this concept recently; I do not recall hearing this previously. An interesting description, and I think accurate. This is quoted from Wikipedia:
Bebbington is widely known for his definition of evangelicalism, referred to as the "Bebbington quadrilateral", which was first provided in his 1989 classic study Evangelicalism in Modern Britain: A History from the 1730s to the 1980s. Bebbington identifies four main qualities which are to be used in defining evangelical convictions and attitudes:
biblicism, a particular regard for the Bible (e.g. all essential spiritual truth is to be found in its pages)
crucicentrism, a focus on the atoning work of Christ on the cross
conversionism, the belief that human beings need to be converted
activism, the belief that the gospel needs to be expressed in effort
(https://en.m.wikipedia.org/wiki/David_W._Bebbington)
