the sixth letter of the Greek alphabet, used in mathematics, science, and as a symbol for various concepts.
From Greek 'zeta,' borrowed from Phoenician 'zayin' (hook or weapon). The letter's name likely refers to its original shape resembling a hook or zigzag. It entered English through scientific and mathematical terminology that relied on Greek alphabetic symbols.
Greek letters are everywhere in science—alpha particles, beta testing, delta changes—and they're so useful because they're universal symbols understood by scientists globally. Zeta might be the least famous Greek letter, but it shows up in complex analysis and fluid dynamics, quietly doing important work.
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