A shibboleth ( ; Biblical Hebrew: שִׁבֹּלֶת, romanized: šībbōleṯ) is any custom or tradition, usually a choice of phrasing or even a single word, that distinguishes one group of people from another. Shibboleths have been used throughout history in many societies as passwords, simple ways of self-identification, signaling loyalty and affinity, maintaining traditional segregation, or protecting from real or perceived threats.
Origin
The term originates from the Hebrew word shibbóleth (שִׁבֹּלֶת), which means the part of a plant containing grain, such as the ear of a stalk of wheat or rye; or less commonly (but arguably more appropriately) "flood, torrent".The modern use derives from an account in the Hebrew Bible, in which pronunciation of this word was used to distinguish Ephraimites...