A shibboleth [shib-uh-lith] is any distinguishing practice that is indicative of one’s social or regional origin. It usually refers to features of language, and particularly to a word whose pronunciation identifies its speaker as being a member or not a member of a particular group. But, shibboleths can also be customs or practices, such as male circumcision.
Shibboleths have been used by different subcultures throughout the world at different times. For example, during the Battle of the Bulge, American soldiers used knowledge of baseball to determine if others were fellow Americans or if they were German infiltrators in American uniform. Some US soldiers in the Pacific theater used the word ‘lollapalooza’ as a shibboleth to verbally test people who were hiding and unidentified, on the premise that Japanese people often pronounce the letter L as R.
The Daily Omnivore 
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