E2STRDM 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 "Domaines for alphanumeric characteristics" 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_E2STRDM TYPE E2STRDM.
The E2STRDM table consists of various fields, each holding specific information or linking keys about Domaines for alphanumeric characteristics data available in SAP. These include CHARID (Internal counter for objects in an SCE knowledge base), SYMBOLID (Internal counter for objects in an SCE knowledge base), POSNR (Item number)... 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. .