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Tau is the 19th letter of the Greek alphabet, written as τ (lowercase) or Τ (uppercase, which looks like the English letter T). Outside of Greek, English speakers mostly meet this word in math, science, and , where τ is used as a symbol for different things depending on the field — for example, a short amount of time in physics, or a type of statistical measurement.
希臘字母 τ（陶），常見於數學與科學符號。
組成The Greek alphabet, including tau, developed from the earlier Phoenician alphabet.
原始詞典資料14 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
Tauname
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A surname from Chinese.
taunoun/taʊ/
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The letter Τ /τ in the Greek alphabet; being the nineteenth letter of the Classical and Modern Greek, and the twenty-first letter of the Old and Ancient Greek alphabets.
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A Τ-shaped object or sign; a Saint Anthony's cross, sometimes regarded as a sacred symbol.
- Nor ſhall we take in the myſticall Tau, or the Croſſe of our bleſſed Saviour, which having in ſome deſcriptions an Empedon or croſſing foot-ſtay, made not one ſingle tranſverſion.
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ChristianityA Τ-shaped object or sign; a Saint Anthony's cross, sometimes regarded as a sacred symbol.
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The ankh symbol (☥).
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astronomynatural-sciencesChiefly written τ: used to designate the nineteenth star (usually according to brightness) in a constellation.
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businessfinanceA measurement of the sensitivity of the value of an option to changes in the implied volatility of the price of the underlying asset.
- (includes a list of coordinate terms)
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mathematicssciencesChiefly written τ: an irrational and transcendental constant representing the ratio of the circumference of a Euclidean circle to its radius, equal to twice the value of pi (2π; approximately 6.2831853071).
這個拼法也被記錄為下列字的變化形：
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。