A shibboleth , in its original signification and in a meaning it still bears today, is a word or custom whose variations in pronunciation or style can be used to differentiate members of ingroups from those of outgroups. Within the mindset of the ingroup, a connotation or value judgment of correct/incorrect or superior/inferior can be ascribed to the two variants.
The Swedish tiger was used in Swedish propaganda during WW2. The wordplay is not exactly a shibboleth, but the wordplay requires an understanding of Swedish, "tiger" meaning both "tiger", as in the animal, and "to keep silent". The meaning, then, is that you should not blabber about what might be sensitive things and so endanger your nation.
One of a handful of pieces of art that moved me to tears, Doris Salcedo's "Shibboleth" at the Tate Modern. "What is important is the meaning of the piece. The making of it is not important," she said. Asked how deep the fissure goes, she replied: "It's bottomless. It's as deep as humanity." According to the artist, the piece is a statement about racism, with the crack representing the gap between white Europeans and the rest of humanity.
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