Many times I've researched questions via the SAP Cross Application Library. It's difficult to fine.
Please send me the link to the R3 library..... it is in alphabetical order, high level covers all the areas of ERP, and all modules. It's very very detailed for all areas.
etc.... It's very helpful, and won't have to as so many questions...
Are you looking out for Glossary. Please check this link.
Below is the link for ECC library: