System Fields in ABAP

 All the below system fields belong to the data dictionary (DDIC) Structure - SYST.

SY-INDEX for loop counting
SY-SUBRC condition of previous statement
SY-FDPOS position of substring in main string (works with SEARCH)
SY-ABCDE a string of 26 characters
   
SY-ULINE for horizontal lines of any length
SY-VLINE for only one vertical character
   
SY-DATUM for application server's date
SY-UZEIT for application server's current time
SY-DATLO for Presentation server's date
SY-TIMLO for Presentation server's current time
   
SY-DBSYS backend database name
SY-HOST name of application server
SY-SYSID name of the R/3 system
SY-OPSYS name of application server's operating system
   
SY-MANDT Logon client number
SY-UNAME Logon User name
SY-LANGU Logon language
   
SY-MSGID message class name
SY-MSGNO message number
SY-MSGTY message type
SY-MSGV1 message variable 1
SY-MSGV2 message variable 2
SY-MSGV3 message variable 3
SY-MSGV4 message variable 4
   
SY-LSIND secondary list index
SY-PAGNO current page number
SY-LINSZ current width of a line
SY-LINCT current number of lines per page
   
SY-TABIX index of internal table's record
SY-DBCNT no. of records processed by database statement
   
SY-DYNNR current screen number
SY-REPID current program name
SY-TITLE title of the program
   
SY-PFKEY name of the current GUI status
SY-UCOMM funtion code of the current pushbutton or menu option

Courtesy: ABAP Technical Documentation

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