A protractor will indicate an angle that has to be made.
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An arbitrary term, or placeholder. It is used in general proofs to indicate 'up to whatever desired maximum term'.
Pi ( π ) - used in geometry: ratio of cirle's circumferenct to diameter.Theta (θ) - symbol used in trigonometry, to indicate an angle measurement in degrees.Sigma (Σ) - used in math for summation of a series.Delta (Δ) - used to indicate a change in something.There may be others that I haven't listed. There are many more Greek letters used in the different science fields. Hope that helps.
A protractor can be used to measure an angle.
The instrument used to measure a angle is called a protractor!