The lower case letter tau ( ταυ), the 19th letter of the modern Greek alphabet.It represented the voiceless unaspirated alveolar or dental plosive /t/. Lower-case tau ( ταῦ), the 19th letter of the ancient Greek alphabet. The small letter sigma () is used to represent standard deviation in math and statistics. According to the Stefan-Boltzmann law, has a value of 5.670374419 × 10 8 watt per square meter per kelvin to the fourth. ( Teutonista ) a voiceless dental plosive (IPA ).Īncient Greek Etymology ĭerived from its majuscule counterpart Τ. The Greek letter sigma was derived from the Phoenician letter n, meaning tooth. The Stefan-Boltzmann constant, symbolized by the lowercase Greek letter sigma ( ), is a physical constant expressing the relationship between the heat radiation emitted by a black body and its absolute temperature.After clicking the More arrow, click the menu at the top of the symbols list.
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