Please see the common prefixes used in AX 2009 :
Prefix Description
Ax Dynamics AX Typed Data Source
Axd Dynamics AX business Document
BOM Bill of Material
COS Cost Accounting
Cust Customer
HRM Human Resources management
Invent Inventory Management
JMG Shop floor management
KM Knowledge Management
Ledger General Ledger
PBA Product Builder
Prod Production
Proj Project
Purch Purchase
Req Requirements
Sales Sales
SMA Service Management
SMM Sales and Marketting Management
Sys Application Framework and development tools
Tax Tax Engine
Vend Vendor
Web Web Framework
WMS Warehouse Management
Ax Dynamics AX Typed Data Source
Axd Dynamics AX business Document
BOM Bill of Material
COS Cost Accounting
Cust Customer
HRM Human Resources management
Invent Inventory Management
JMG Shop floor management
KM Knowledge Management
Ledger General Ledger
PBA Product Builder
Prod Production
Proj Project
Purch Purchase
Req Requirements
Sales Sales
SMA Service Management
SMM Sales and Marketting Management
Sys Application Framework and development tools
Tax Tax Engine
Vend Vendor
Web Web Framework
WMS Warehouse Management