Numbers from

... and for similar facts about other numbers see Numbers: Facts, Figures & Fiction.
Website copyright © Richard Phillips 1994/2003.
2 is a prime number and is the only even prime number.
= 1 x 2
Factorial 2 or 2!
1, 1, 2, 3, 5, 8, 13...
A Fibonacci number.
A deuce, a couple, a brace, a duo or a pair...
There are two blades on a pair of scissors and two sides to a piece of paper. People have two hands and so do some clocks. There are two sexes and two sides to an argument. Twodimensional means that something has just length and width, but no depth.
Two's company, three's a crowd all depends on who you happen to be with.
Bi means two. For example, a bicycle has two wheels and a bigamist has two husbands or two wives.
Two wheels on a bicycle.
In binary code numbers are written to the base two. It uses just two symbols, 0 and 1. The numbers 1, 2, 3, 4, 5, 6... become 1, 10, 11, 100, 101, 110...
The letters H, I and X all have two lines of symmetry.
Two has a very special
property because
2 + 2 = 4
and also
2 x 2 = 4.
Try to find a number ?
where
? + ? + ?
and
? x ? x ?
both give the same answer. A calculator could help you here.