1000 (number)

1000 or one thousand is the natural number following 999 and preceding 1001. In most English-speaking countries, it is conventionally written with a comma separating the thousands unit: 1,000.

It may also be described as the short thousand in historical discussion of medieval contexts where it might be confused with the Germanic concept of the "long thousand" (1200).

In mathematics

Number

A number is a mathematical object used to count, measure, and label. The original examples are the natural numbers 1, 2, 3, and so forth. A notational symbol that represents a number is called a numeral. In addition to their use in counting and measuring, numerals are often used for labels (as with telephone numbers), for ordering (as with serial numbers), and for codes (as with ISBNs). In common usage, the term number may refer to a symbol, a word, or a mathematical abstraction.

In mathematics, the notion of number has been extended over the centuries to include 0, negative numbers, rational numbers such as and , real numbers such as and , complex numbers, which extend the real numbers by including , and sometimes additional objects. Calculations with numbers are done with arithmetical operations, the most familiar being addition, subtraction, multiplication, division, and exponentiation. Their study or usage is called arithmetic. The same term may also refer to number theory, the study of the properties of the natural numbers.

1000

Year 1000 (M) was a leap year starting on Monday (link will display the full calendar) of the Julian calendar. It was also the last year of the 10th century as well as the last year of the 1st millennium of the Dionysian era ending on December 31st, but the first year of the 1000s decade.

The year falls well into the period of Old World history known as the Middle Ages; in Europe, it is sometimes and by convention considered the boundary date between the Early Middle Ages and the High Middle Ages. The Muslim world was in its "Golden Age". China was in its Song dynasty, Japan was in its "classical" Heian period. India was divided into a number of lesser empires, such as the Rashtrakuta Dynasty, Pala Empire (Kamboja Pala dynasty; Mahipala), Chola dynasty (Raja Raja Chola I), Yadava dynasty, etc. Sub-Saharan Africa was still in the prehistoric period, although Arab slave trade was beginning to be an important factor in the formation of the Sahelian kingdoms. The pre-Columbian New World was in a time of general transition in many regions. Wari and Tiwanaku cultures receded in power and influence while Chachapoya and Chimú cultures rose toward florescence in South America. In Mesoamerica, the Maya Terminal Classic period saw the decline of many grand polities of the Petén like Palenque and Tikal yet a renewed vigor and greater construction phases of sites in the Yucatán region like Chichén Itzá and Uxmal. Mitla, with Mixtec influence, became the more important site of the Zapotec, overshadowing the waning Monte Albán. Cholula flourished in central Mexico, as did Tula, the center of Toltec culture.

Billboard Hot 100

The Billboard Hot 100 is the music industry standard record chart in the United States for singles, published weekly by Billboard magazine. Chart rankings are based on radio play, online streaming, and sales (physical and digital).

The weekly sales period was originally Monday to Sunday when Nielsen started tracking sales in 1991, but since July 2015, this has been changed from Friday to Thursday. Radio airplay, which unlike sales figures and streaming data, is readily available on a real-time basis and is tracked on a Monday to Sunday cycle (it was previously Wednesday to Tuesday). A new chart is compiled and officially released to the public by Billboard on Tuesdays. Example: