the.com/shamrock

A clover with a PR team — Ireland's logo since before logos existed.

means A small three-leaved clover, especially one used as a symbol of Ireland and St. Patrick's Day.

from From Irish 'seamróg,' a diminutive of 'seamair' (clover) — literally 'little clover.' The symbolism traces to a folk legend that St. Patrick used its three leaves to explain the Holy Trinity to pagan Ireland; the story is beloved but undocumented in any early record, so it's best called tradition rather than history. The word entered English in the 1500s-1600s as English writers described Irish customs, and it's been doing heavy symbolic lifting — nationalism, tourism, beer dye — ever since.

not a species
any small three-leafed clover gets the title
patrick's prop
legend says he used it to explain the trinity
four-leaf myth
shamrocks are three leaves, four is a different lucky thing
national emblem
official symbol of ireland since the 17th century
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