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Shibboleth - any custom or tradition, usually a choice of phrasing or single word, that distinguishes one group of people from another. Shibboleths have been used throughout history in many societies as passwords, ways of self-identification, signals of loyalty and affinity, ways of maintaining traditional segregation, or protection from real or perceived threats.(en.wikipedia.org)
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In 1978, Zbigniew Brzezinski advised Carter to engage the People's Republic of China, travel to Beijing, and to lay the groundwork for the normalization of relations. This also resulted in the severing of ties with Taiwan. (A long time anti-Communist ally known then as the Republic of China.)(en.wikipedia.org)