Type  Description  Example 

Scalar  A Scalar is a single value, usually containing a name or a number.  A < 2 NAME < 'John' 
Vector  A vector contains a list of values or names. It corresponds to a variable in statistics. 
V < 2 5 3 2 7.4 NAMES < 'Joe,Bill,Bob'

Matrix  A matrix is a table of values.  M<buildTable 'M,F' 'D,I,R' 