A convenient way to measure intervals by the log of the frequency ratio. 100 cents make a semitone, 1200 cents make an octave. The interval in cents between two frequencies f1 and f2 is 1731.234 * ln (f2 / f1) where ln is the log to base e.
The United States one-cent coin, commonly called a penny, is a unit of currency equaling one-hundredth of a United States dollar. Its obverse has featured the profile of President Abraham Lincoln since 1909, the centennial of his birth. Since 1959 (the sesquicentennial of Lincoln's birth), the reverse has featured the Lincoln Memorial.
In currency, the cent is a monetary unit that equals 1/100 of the basic unit of value. The word also refers to the coin which is worth one cent. In the United States and Canada, the 1Â¢ coin is generally known by the nickname penny, alluding to the British coin and unit of that name.
The cent is a logarithmic unit of measure used for musical intervals. Typically cents are used to measure extremely small intervals, or to compare the sizes of comparable intervals in different tuning systems, and in fact the interval of one cent is much too small to be heard between successive notes.