Shibboleth

contraseña

(a word, pronunciation, or custom, distinguishing members of a group, especially as a test)

doctrina anticuada

(a common or longstanding belief, custom, or catchphrase associated with a particular group, especially one with little current meaning or truth)

santo y seña

(a word, pronunciation, or custom, distinguishing members of a group, especially as a test)

shíbolez

(a word, pronunciation, or custom, distinguishing members of a group, especially as a test)