coordinate
In Deriscope terminology, a coordinate is considered integral part of a Set and therefore - by extension - also part of a Table, since the axes of a Table are represented by Sets
Concretely, it is an ordered collection - i.e. a 1D-array - of coordinate values
For example, in the case of a volatility table with an expiry and strike axis, there exist two coordinates that correspond to the expiry and strike axes.