[RegulatorCountry]

I'm not Jewish, but friends and business associates are, so I've been to Temple for weddings, funerals, Bar Mitzvahs and Bat Mitzvahs... which leads me to this question: what the heck is that square thing growing out of his forehead, like the monolith from 2001: A Space Odyssey?

[oyez]

phy·lac·ter·y ( P ) Pronunciation Key (f-lkt-r)
n. pl. phy·lac·ter·ies
Judaism. Either of two small leather boxes, each containing strips of parchment inscribed with quotations from the Hebrew Scriptures, one of which is strapped to the forehead and the other to the left arm; traditionally worn by Jewish men during morning worship, except on the Sabbath and holidays.