Ok, I am now kinda creeped out. Tera - Luna. Initially I thought (Tera = Trillion + Luna = Moon) = The trillionth moon, which would fit. But then it came to mind that Moon = Lunar and googled what Luna is defined as.
Here, at the top it says

Originally Posted by
wordnetweb.princeton.edu
(Roman mythology) the goddess of the Moon; counterpart of Greek Selene
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