1) abbreviation for caudal fin
2) abbreviation for caudal fin rays
3) Carboniferous, a period within the Paleozoic Era ca. 365-290 million years ago
4) the Roman numeral 100
5) degrees centigrade, a measure of temperature. Note that 12°C is a temperature while 12C° is a number of degrees or a range, e.g. 20-31°C inclusive

Dictionary of ichthyology. 2009.

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