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It depends on which type of plotter you're asking about. It could be a navigational instrument used for calculating a boat's passage or it could be someone who is planning to perform some underhand deed or it could be someone who tracked incoming enemy aircraft during World War 2.
what is indian national instrument
the Flute is the National Instrument of Ireland
This is a Ching. It is a kind of instrument that originates in Thailand. .
The Guillotine was a French instrument of execution.
Arithmetical calculations.
Arithmetical calculations.
calculator
Abacus is an instrument used for calculating. It begins with the letter a.
The abacus was an instrument used by Greeks and Romans for arithmetic calculations, preceding the slide-rule and the electronic calculator, and consisted of perforated pebbles sliding on iron bars.
A table or tray strewn with sand, anciently used for drawing, calculating, etc., A calculating table or frame; an instrument for performing arithmetical calculations by balls sliding on wires, or counters in grooves, the lowest line representing units, the second line, tens, etc. It is still employed in China., The uppermost member or division of the capital of a column, immediately under the architrave. See Column., A tablet, panel, or compartment in ornamented or mosaic work., A board, tray, or table, divided into perforated compartments, for holding cups, bottles, or the like; a kind of cupboard, buffet, or sideboard.
A table or tray strewn with sand, anciently used for drawing, calculating, etc., A calculating table or frame; an instrument for performing arithmetical calculations by balls sliding on wires, or counters in grooves, the lowest line representing units, the second line, tens, etc. It is still employed in China., The uppermost member or division of the capital of a column, immediately under the architrave. See Column., A tablet, panel, or compartment in ornamented or mosaic work., A board, tray, or table, divided into perforated compartments, for holding cups, bottles, or the like; a kind of cupboard, buffet, or sideboard.
A Texas Instruments graphing calculator can be used as a basic calculator, a scientific calculator and a graphing calculator.
abacus
the slide rule
Hourglass.
A backstaff is a an early navigational instrument for measuring the altitude of the sun and hence calculating latitude.