plotter

[plot-er] /ˈplɒt ər/
noun
1.
a person or thing that plots.
2.
an instrument, as a protractor, for plotting lines and measuring angles on a chart.
3.
Computers. an output device that produces a graphical representation by drawing on paper, as with one or more attached pens.
Origin
1580-90; plot + -er1
British Dictionary definitions for plotters

plotter

/ˈplɒtə/
noun
1.
an instrument for plotting lines or angles on a chart
2.
a person who plots; conspirator