On any ordinary day, yellow school buses with the Hebrew names of yeshivas dominate the ultra-Orthodox landscape of Borough Park, Brooklyn. But in the days before Passover, large trucks parked along many of the sidewalks are far more striking, particularly those bearing signs with a Hebrew word obscure even to most Jews: Sheimos.

Sheimos (pronounced SHAME-os) is a term for religious books containing the Hebrew name of God that need to be ritually buried in the ground.

As Passover approaches, Orthodox Jews strive to rid their homes of even the slightest trace of bread or other unleavened grain products known as chametz, almost down to the molecule. Bibles, prayer books and volumes of Talmud receive a thorough airing as well, and the most dog-eared specimens are often discarded. But Jewish religious law considers throwing them in the trash a desecration.

So parked all day on many streets in Borough Park and nearby neighborhoods like Midwood are trucks whose drivers will carry books to a cemetery upstate for a fee of about $8 to $10 a box.