shibboleth /ˈʃɪbəlɛθ/ noun a custom, principle, or belief distinguishing a particular class or group of people, especially a long-standing one regarded as outmoded or no longer important. “the majority, under the influence of vague nineteenth-century shibboleths, understood him to be associating himself with the doctrine that every nation has a right to be a sovereign state”

It’s funny. My brain sometimes produces the word shibboleth when I’m trying to remember shoggoth too. How fuckin’ weird that we use either word frequently enough for that to be a thing 🤣