why we call SAP R/3 system?

Answer 1

version 3 ... dumbo decker

Answer 2

SAP Introduction
SAP means Systemanalyse und Programmentwicklung. This is german for System analysis and program development.
The name was later changed into Systeme, Anwendungen und Produkte in der Datenverarbeitung: Systems, application and products in the data processing.

The company is specialized in large application supporting large corporations.
SAP is well known for its ERP solution R/3. The modularity of the product allows a certain fexibility in the implementation and use.

The major components within R/3 are

Financial system
Project system
Logistic system
Human ressource
Developpment system (ABAP)

The major components outside R/3 are :
Netweaver
SAP Business Warehouse and Strategic Entreprise Management
Others

Answer 3

SAP R/3 is perhaps the best known ERP (Enterprise Resource Planning) system on the market. Originally dating back to the 1970s, it took the then-controversial approach of combining various business functions into one application and database. Originally, R/2 was implemented atop mainframe databases like DB/2 , Adabas, and IMS.

In the 1980s, SAP designed a new architecture for the new R/3 system using a multi-tiered Client/Server architecture, with data storage on a database server running some relational database, application code, written in their ABAP/4 language, running on a set of application servers.

SAP intended to keep a degree of vendor-independence; the application server software can run on a number of platforms that have included several Unix flavors, VMS, and Microsoft Windows NT, whilst they have supported a variety of relational databases, including Oracle, Adabas, Informix, Microsoft SQL Server. Front end software uses their own proprietary protocols atop TCP/IP, and has run on various platforms. (by Cristopher Browne)

R/3 covers application areas such as logistics, human resources, and accounting, which are divided into several modules. Examples for such modules are FI (financial accounting), TR (treasury), CO (controlling), PA (personal administration), HR (personal planning and recruitment), MM (materials management), SD (sales and distribution), PP (production planning and control), or PS (project system).