Whereas the circuit element topology is typically schematically drafted, these commands are usually placed on the schematic as text specified to be SPICE directives. All such commands start with a period and are therefore called "dot commands".
.BACKANNO -- Translate Port Current Names
.ENDS -- End of Subcircuit Definition
.FOUR -- Compute a Fourier Component
.FUNC -- User Defined Function
.FERRET -- Download a File from URL
.GLOBAL -- Declare Global Node
.LOADBIAS -- Load a Bias Point
.MEASURE -- Waveform Measurement
.MODEL -- Define a SPICE Model
.NET -- Compute Network Parameters
.NODESET -- Supply Hints for the .OP
.PARAM -- User-Defined Parameters
.SUBCKT -- Define a Subcircuit
.TF -- DC Small Signal Transfer Function