BUILT-IN MATHEMATICA SYMBOL
Directive
Directive[g1, g2, ...]
represents a single graphics directive composed of the directives 
, 
, ....
Give composite directives for primitives in a graphic:
| Out[1]= |  |
Give a composite directive for a single curve or surface in a plot:
| Out[1]= |  |
| Out[2]= |  |
Give a composite directive for each curve in a plot:
| Out[1]= |  |
Combine font styles:
| Out[1]= |  |
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