It is called a host
The afikoman. It's a piece of matzah (specially-prepared unleavened flat bread).
A wafer is a thin, light biscuit or cookie, a piece of unleavened bread, or a soft disc made from flour.
An antidoron is an ordinary piece of leavened bread fro the remnants of the loaves used for the Eucharist, which is blessed but not consecrated, and distributed in churches which use the Byzantine right.
It is called an egg in a basket !! FYI
The Israelis do not celebrate the last supper. The Jews celebrate Passover. At Passover, they set an extra place at the table for an unexpected guest. It will have a glass of wine. There will be a piece of unleavened bread or Matzoh. It is hard as a rock. At least it is thin. If you have a Jewish friend or know a Jewish family, you will be welcome if you drop in for the Passover meal. You may use the empty chair and join the Passover meal. It might be the only time of the year you are welcome to drop in unannounced and eat.
A closed sandwich has a piece of bread on the top, whereas an open sandwich does not have the top piece of bread.
The first and last piece of bread is called the "heel" is is oddly shaped due to it taking on the shape of the end of the pan it was baked in.
piece of bread
Piece of bread
The cast of Piece of Bread - 2010 includes: Mohammad Bakri
The cabbage
An afikomen is a matzoh eaten at a Passover seder.