1000 (number)

The kilogram (also spelled kilogramme) is the base unit of mass in the International System of Units (SI), equal to one thousand grams. It has the unit symbol kg. The word "kilogram" is formed from the combination of the metric prefix kilo- (meaning one thousand) and gram; it is commonly shortened to "kilo" (plural "kilos").

The kilometre (SI symbol: km; or ), spelt kilometer in American English, is a unit of length in the International System of Units (SI), equal to one thousand metres (kilo- being the SI prefix for ). It is the preferred measurement unit to express distances between geographical places on land in most of the world; notable exceptions are the United States and the United Kingdom where the statute mile is used.

A millennium () is a period of one thousand years, one hundred decades, or ten centuries, It is also sometimes called a kiloannum (ka) or kiloyear (ky).

natural number

thumb|330px|Different lengths with respect to the electromagnetic spectrum. The [[microwave spans from 1 metre to 1 millimetre.]]

unit for parts per thousand

Kilo is a unit prefix in the metric system of measurement, denoting multiplication by one thousand (103). The International System of Units reserves the lowercase symbol k.

Milli (symbol m) is a unit prefix in the metric system denoting a factor of one thousandth (10−3). Proposed in 1793, and adopted in 1795, the prefix comes from the Latin , meaning one thousand (the Latin plural is ). Since 1960, the prefix is part of the International System of Units (SI).

thumb|A whole regular chiliagon is not visually discernible from a circle. The lower section is a portion of a regular chiliagon, 200 times as large as the smaller one, with the vertices highlighted. In geometry, a chiliagon () or 1,000-gon is a polygon with 1,000 sides. Philosophers have used chiliagons to illustrate ideas about the nature and workings of thought, meaning, and mental representation.

Japanese legend

idiom suggesting seeing something is better for learning than having it described

The millioctave (moct) is a unit of measurement for musical intervals. As is expected from the prefix milli-, a millioctave is defined as 1/1000 of an octave. From this it follows that one millioctave is equal to the ratio 21/1000, the 1000th root of 2, or approximately 1.0006934 ().

thumb|1/100 heptaméride (jot), 1/10 heptaméride (decameride), 1 heptamérides, 10 heptamérides, 100 heptamérides, 1,000 heptamérides (decade).