The phrase "a stratum called" is correct and usable in written English.
It can be used when referring to a specific layer or level within a classification or hierarchy, often in scientific or academic contexts.
Example: "In geology, there is a stratum called the Cambrian that is known for its rich fossil record."
Alternatives: "a layer referred to as" or "a level designated as".
The first three big towns in a state were grouped as a stratum and called major towns; all other urban settlements were grouped to form another stratum and called medium towns.
At present, expected BSI rates are crudely calculated for three hospital strata (called "levels") which roughly correspond to the size of, and types of services provided by, the facility.
In thick, glabrous skin lacking hair follicles, such as that on human palms and soles, a clear layer, called the stratum lucidum, can be distinguished between the stratum granulosum and the stratum corneum.
Epidermis, the outer skin layer, has a surface called stratum corneum, which is a less hydrated surface layer presented at the air/skin interface.
For each stratum h, a dispersion measure called stratum variance, Q h is calculated: Q_{h} = sqrt{{n_{h}^{2}}times bar{upgamma}(A_{h}, A_{h})} (2).
For each stratum h, a dispersion measure called stratum variance, Q h is calculated: Q_{h} = sqrt{{n_{h}^{2}}times bar{upgamma}(A_{h}, A_{h})} (2) where A h is the area of the stratum h and (bar {upgamma }(cdot)) is the average semivariance of the stratum.
Given a stratification (mathcal {P}_1, ldots, mathcal {P}_n) of (mathcal {P}), each (mathcal {P}_i) is called a stratum of the stratification, and (f) is called the stratification mapping.
The 10 random steps together with the real step are called a stratum in the statistical language.
In October, Kaliouby took the Acela to New York to speak at a conference, called Strata + Hadoop World, at the Javits Center.
