SIC_FIELDS_FOR_INDEXING 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 "Fields to be indexed and used for searching" 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_SIC_FIELDS_FOR_INDEXING TYPE SIC_FIELDS_FOR_INDEXING.
The SIC_FIELDS_FOR_INDEXING table consists of various fields, each holding specific information or linking keys about Fields to be indexed and used for searching data available in SAP. These include NODE_NAME (Node Name), COUNTER (Counter), TABLENAME (Table Name), FIELDNAME (Field Name)... 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. .