Lovecraft Allusion in Umberto Eco's Foucault's Pendulum

Jack Faber recently alerted me to this cool quote. He says,

"...near the end of chapter 113 of Foucault's Pendulum: Then I saw Lorenza slumped at Belbo's feet, her face waxen, and Pierre, holding up the red blade, shouted: "Enfin, le sacrifice humain!" Turning toward the nave, he said in a loud voice: "I'a Cthulhu! I'a S'ha-t'n!" "

Umberto Eco, Foucault's Pendulum (1988). Eco was born in 1932 in Alesandria, Italy and is professor of semiotics at the University of Bologna.