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In almost every textbook, I've found that the speed of light is $c \approx 3 \times 10^8\: \mathrm{m/s}$. I wonder why it's just $c$ ?

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closed as off-topic by jinawee, Waffle's Crazy Peanut, Kyle Kanos, Valter Moretti, Brandon Enright Feb 10 '14 at 16:12

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It's c for constant or celeritas, which means speed in Latin. Everyone uses it because it's convention. You could use $\xi$ or $\zeta$ or $\gamma$ or any other symbol you wanted, but then you'd have to explain what it meant, and people would have to go through the trouble to remember this every time they read your papers. Better to go with convention and save everyone the headache

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