Vectors, one-dimensional arrays of values.
[[someone should add some words on how a vector differs from an array]]
Related pages:
   * [Vector or matrix algebra in Tcl]
   * [Low-level vector data in Tcl]
   * [Vkit is a vector engine]
   * [vector.tk]
   * [Feather VectorObj]

[BLT] contains vector operations too.

In [pure-Tcl], lists are most appropriate for representing vectors.