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A 'yardstick' is a tool used to physically measure lengths of up to 'three feet' (a yard).
Most yardsticks are flat wooden boards with black markings at regular intervals and metal tips. Many new yardsticks have imperial units markings on one side (three feet with inch and fractional inch) and metric units on the other side (one meter with centimeter and millimeter).
Yardsticks may be used as pointing devices for posters and projections.
The term "yardstick" may also be used informally or metaphorically in reference to anything which serves as a test or standard of measurement, comparison or judgement (also see benchmark and litmus test).