Nat or Natural Unit
Nat or Natural Unit :
A unit of information content used in information and communications theory. The nat is similar to the shannon but uses the natural logarithm (to the base e) instead of the logarithm to the base 2. If the probability of receiving a particular message is p, then the information content of the message is -loge p nats. For example, if a message is a string of 5 letters or numerals, with all combinations being equally likely, then a particular message has probability 1/365 and the information content of a message is 5(loge 36) = 17.9176 nats. One nat equals log2 e = 1.442 695 shannons or log10 e = 0.434 294 hartleys
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