SAP ABAP Naming Coventions or Naming Standards.

ABAP has a large number of naming conventions for different language elements. These are conventions and not rules, so an ABAP programmer is free to abide by them or not. However ABAP code developed by SAP itself generally respects these naming rules. Below is a list.

* ALV_ SAP List Viewer
* AS_ Methods that perform type conversions
* CHECK_ Check Methods
* CH_ Changing Parameters
* CT Changing Table
* CL_ Class name
* C_ Constants
* DR_ Data reference
* G_ Global variables/data objects
* GT_ Global table
* GX_ Global boolean field (X or space)
* IF_ Interface
* I_ Internal Table
* IS_ Methods that return a Boolean value
* L_ Indicates the data object is local.
* LC_ Local Constant
* LV_ Local Variable
* LR_ Local Range
* LT_ Local Table
* LS_ Local Structure
* LVC_ List Viewer Control
* ON_ Event handler
* P_ Parameters
* PE_/EX_ Export parameter
* PI_/IM_ Input parameter
* RA_ Ranges/Type Range Of
* RE_ Result
* RF_ Reference Variable
* SET_ Accessors Methods
* SO_ Select-Options
* ST_ Structure
* TI_ / I_ Internal Standard Table
* TC_ Table Control
* TH_ Internal Hashed Table
* TP_ Other Variables
* TS_ Internal Sorted Table
* TT_ Table type
* TY_ Types
* T_ Variable is a table (T_MY_TABLE_VARIABLE)
* X_ Source/first data object (e.g. XVBAK)
* Y_ Destination/second data object (e.g. YVBAK)
* WA_ Work Area
* S_ Static Variable
* RB_ Radio Button
* CB_ Check Box
* Z/Y Program Name
* F[0-9][0-9]_ Subroutine or Function Module Name