Wow, I learned a new word today! I've never heard this word before, here it is:

Word of the day:

shib·bo·leth ( P ) Pronunciation Key (shb-lth, -lth)
n.

1. A word or pronunciation that distinguishes people of one group or class from those of another.
2.
1. A word or phrase identified with a particular group or cause; a catchword.
2. A commonplace saying or idea.
3. A custom or practice that betrays one as an outsider.