A nanometer is a billionth of a meter. One nanometer (nm) is one billionth, or 10, of a meter. On 19 October 2004, the one billionth (1,000,000,000) transaction was recorded. On October 19, 2004, the one billionth (1,000,000,000) transaction was recorded. In early 2010, Apple celebrated the 10 billionth song downloaded from the iTunes Music Store. The use of laser cooling has produced temperatures less than a billionth of a kelvin. In September 2011, Microchip Technology shipped the 10 billionth PIC microcontroller. In more technical terms, the word "nano" means 10, or one billionth of something. On February 23, 2006, the iTunes Music Store sold its 1 billionth song. The billionth application was downloaded on April 24, 2009. The billionth jar of Vegemite was produced in October 2008. The nanowatt (nW) is equal to one billionth (10) of a watt. It carried its 1.5 billionth passenger on January 24, 2007. Nano- (symbol n) is a unit prefix meaning "one billionth". Nevertheless, several newborns were selected by various groups to represent the seven billionth person.