Yasht
Twenty-one Zoroastrian hymns to individual divine beings that are eligible for veneration, like Mithra, Bahram and Haoma.
Yazidism
Religion with around 700,000 members worldwide. The largest group lives in Iraq, near Mosul, but there are small communities in Syria, Turkey, Georgia, and Armenia.
Yom Kippur
Day of Atonement. Observed on the tenth of the month of Tishri, the first in the Jewish calendar and part of Rosh Hashanah.
Yom Kippur War
Also known as Ramadan War and October War. Fought between Israel on one side, and Egypt and Syria on the other, backed by Iraq and Jordan and supported economically by Saudi Arabia. Began October 6, 1973 and ended on October 22 on the Syrian front, and on October 26 on the Egyptian front.