Oh, I meant common within the field of social geography. I noted that they'd talk about shibboleths of various sorts (language, accent, dress, manners). I would

Oh, I meant common within the field of social geography. I noted that they'd talk about shibboleths of various sorts (language, accent, dress, manners). I wouldn't expect your average person to know about it but it's not obscure in any way for the type of article this is. OTOH, I first heard the term it was from working with academic institutions in the UK, because Shibboleth seems to be the favoured form of SSO there (though apparently it came from the Internet2 group, which is US). So anyone doing SSO or SAML etc would probably have heard the word and you'd have to be fairly incurious not to look it up :-)