High warp and low warp are the terms so often used as to seem a shibboleth.
"The Tapestry Book"
Helen Churchill Candee
When we got back to the inn, Marcoline told me that her new friend had given her the Florentine kiss: this is the shibboleth of the sect.
"The Memoires of Casanova, Complete The Rare Unabridged London Edition Of 1894, plus An Unpublished Chapter of History, By Arthur Symons"
Jacques Casanova de Seingalt
The blacks still continued to shout their shibboleth, pointing to Somerset, which they called "Kaieeby."
"The Overland Expedition of The Messrs. Jardine"
Frank Jardine and Alexander Jardine