Siemens Sinumerik 840D sl Programming Manual page 146

Abbreviations
TOA Tool Offset Active: Identifier (file type) for tool offsets
TRANSMIT Transform Milling Into Turning: Coordinate conversion in turning machine for milling
UFR User Frame: Work offset
UP Subroutine
FDD Feed drive
V.24 Serial interface (definition of the interchange lines between DTE and DCE)
WCS Workpiece coordinate system
T Tools
TLC Tool length compensation
WOP Workshop-oriented programming
WPD Workpiece Directory: Workpiece directory
TRC Tool radius compensation
TO Tool change
TC Tool change
ZOA Zero Offset Active: Identifier (file type) for work offset data
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Programming Manual, 06/09, 6FC5398-7BP10-1BA0
ISO Milling