Baud rate
In telecommunications the baud is a measure of symbols transmitted per second in a modulated signal. It is named after Émile Baudot, the inventor of the Baudot code for telegraphy.
The term baud is sometimes misused to refer to "bits per second"; though it is possible for one event to carry one bit, it is more common to make more efficient use of bandwidth by transferring several bits—as many as sixteen—in one event. Thus, a 2400-bit/s modem actually transmits at 600 baud, where each quadrature amplitude modulation event carries four bits of information.
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