The term "shibboleth" in literature often functions as a marker of linguistic or cultural identity, highlighting the divide between insiders and outsiders. In Byron's portrayal, the word is ironically used by Juan—whose limited grasp of English reduces his language to that single expletive—emphasizing his outsider status and vulnerability in a foreign tongue [1]. Meanwhile, Galdós employs the term in a more abstract, formulaic manner, suggesting that "shibboleth" can transcend its literal meaning to become emblematic of accepted norms or rituals within a society [2].