Permian-Triassic extinction
Alternative spelling of 30s
(chemistry, in combination) Nine atoms of lead in a chemical compound.
(evolutionary theory, geology) A volcanic mass extinction at the end of the Permian period 251.9 million years ago.
(computing, telecommunications) A single metacharacter, usually a control code, which in a sequence of characters signifies that what is to follow takes an alternative interpretation. The term esca...
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