45 (number)
45 is the natural number following 44 and preceding 46.
In mathematics
45 is a composite number and a Størmer number.Forty-five is conjectured from Ramsey number.
Forty-five degrees is half of a right angle.
In music
- A type of gramophone record classified by its rotational speed of 45 revolutions per minute
In other fields
- Guns or ammunition of.45 caliber. In the United States, "45" is often a reference to one of two specific.45 caliber cartridges—the.45 Colt or the.45 ACP.
- In years of marriage, the sapphire wedding anniversary.
- Issue 45 of The North Briton was thought to be seditious but its publisher, John Wilkes, was celebrated as a champion of liberty. The number 45 was used as a symbol of support for him. Banquets were held with a theme of 45 while many items were produced showing the number or featuring it in some way. For example, a wig was produced with 45 curls.