IBVALUE is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "IB: Characteristic value" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_IBVALUE TYPE IBVALUE.
The IBVALUE table consists of various fields, each holding specific information or linking keys about IB: Characteristic value data available in SAP. These include ATWRT (Characteristic Value), ATFLV (Internal floating point from), ATFLB (Internal floating point value to), ATCOD (IB: Interval limits)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .