An interesting question. I looked it up; and the consensus is that the braiding of the Challah represents unity, intertwining, the central point, innerness, connectedness.
The three braids could hint to any of the "threes" in Judaism: kohen Levi Yisroel (the three divisions of families), Torah Neviim Ketuvim (Jewish Bible), the three Sabbath meals, etc.
They don't symbolize anything, some people just like poppy or sesame seeds.
Capitalize challah bread
It's challah
Challah is a braided loaf of egg-bread.
It's used to cut the challah-bread on shabbat.
Do a Google search of What Is The Origin Of Jewish Challah Bread. The top result is a Wikipedia article on that subject.
Challah is Jewish bread.
Challah.
The sabbath is an everlasting covenant between the Jewish people and G-d. A part of its observance is to enjoy the day. Meals eaten at night, during the morning and late afternoon are all part of its observance and enjoyment.
Matzah; also spelled matzoh. This thin unleavened bread is eaten during Passover. See also:More about Passover and the Seder
If you are referring to challah, it is made from: flour, eggs, water, oil, yeast, sugar, and salt. If you're referring to matzah, it is made from: flour and water There is also matzah that has egg in it or apple juice.
Italian bread and challah are produced from very different doughs. Italian bread is basically flour and water with very little if any added sugar or oil. Challah is a rich bread with eggs as well as other ingredients, requiring lower temperature and a longer baking time than Italian bread.
The name of the bread prepared for the Sabbath by Jews is called Challah. It has no unique "symbol" although the spelling of the name "Challah" in Hebrew letters is (חלה). (Note that the Sabbath-bread, or Challah, is actually baked before the Sabbath, since the Sabbath is a day of rest.)