Programmer Guide/Concepts/Extended table

Extended tables (as opposed to simple tables, parameter tables and directory tables) are able to store data of mixed types (integers, floating-point numbers, strings, and STx names) in one or more columns, each column being also known as a field. Fields may be assigned names which, in turn, may be used for accessing the content of the respective field. Regardless of a field being assigned a name, its content may always be referred to by its zero-based index.

For a thorough introduction into the matter of table items, see Introducing Table Items.