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A curve that is a function and resembles the sine or cosine curve.

Trigonometric Curve

A curve that is a function and resembles the sine or cosine curve.

"The curve of sines, in which the abscissas are proportional to an angle, and the ordinates to its sine." -Whitney, 1889

Sinusoid or Sine Wave

"The curve of sines, in which the abscissas are proportional to an angle, and the ordinates to its sine."…

A chair that also serves as a stepladder when folded differently.

Combination Chair and Stepladder

A chair that also serves as a stepladder when folded differently.