The atomic number of titanium.
The number of letters in the Hebrew alphabet.
In the Kabbala, the number of paths between the sephiroth.
The number of yards in a chain. A cricket pitch is 22 yards in length.
The narrowest f-stop available in most single-lens reflex cameras.
The number of cards in the Major Arcana of a tarot deck, if you include the fool.
The number of players in a rugby union squad for international and other top-level matches. Seven of the players are "on the bench", ready to play as replacements or substitutes.
- from http://www.fact-index.com/t/tw/twenty_two_1.html