Words that are reserved for implementing syntax in files used as inputs to the Quartus® Prime Standard Edition software. Such files include AHDL Text Design Files (.tdf), VHDL Design Files (.vhd), Verilog Design Files (.v), Quartus® Prime Standard Edition Project Files (.qpf), and Quartus® Prime Standard Edition Settings Files (.qsf). For example, the keyword OF is reserved in AHDL files, and therefore cannot be used as an unquoted symbolic name in an TDF File.