Geodesic
The Ascending and Descending Varietal Chains of a Variety
Canadian journal of mathematics, Tome 27 (1975) no. 1, pp. 25-31

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Let F be a variety (equational class) of algebras. For n ≧ 0, Vn is the variety generated by the F-free algebra on n free generators while Vn is the variety of all algebras satisfying each identity of V which has no more than n variables. (Equivalently, Vn is the class of all algebras, , such that every n-generated subalgebra of is in V.) Note that unless nullary operation symbols are specified by the similarity type of V, V0 is the variety of all one element algebras while V° is the variety of all algebras. 
Jónsson, B.; McNulty, G.; Quackenbush, R. The Ascending and Descending Varietal Chains of a Variety. Canadian journal of mathematics, Tome 27 (1975) no. 1, pp. 25-31. doi: 10.4153/CJM-1975-004-2
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