the·ta /ˈθetə, ||ˈθitə/
希蠟字母的第八字
The·ta n. A letter of the Greek alphabet corresponding to th in English; -- sometimes called the unlucky letter, from being used by the judges on their ballots in passing condemnation on a prisoner, it being the first letter of the Greek qa`natos, death.
Theta function Math., one of a group of functions used in developing the properties of elliptic functions.
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theta
n : the 8th letter of the Greek alphabet