who knows twenty-two?

22 letters of the aleph-bet, the hebrew alphabet

&

no. of verses in each chapter of the book of Eichah (apart from chapter 3 which has 66 verses, 3 x 22)
no. of years Yosef and Ya'acov were separated
date in Nisan of the last day of Pesach, and in Tishrei and the last day of Succot.
22 paths between the Sephirot
22 ÷ 7 = π (approx.)
tarot decks have 22 cards
Catch-22
and in bingo twenty-two is called Two Little Ducks

we are now in the fourth week of the omer, hence the quadrilateral. not a square, that doesn't fit into an icosadigon (22 sided polygon). but 22 barley grains do very neatly form the perimeter of a rectangle within the icosadigon, with a grain on a different intersection of points.