801 (number)

In mathematics, the natural numbers are those used for counting and ordering. In common mathematical terminology, words colloquially used for counting are "cardinal numbers" and words connected to ordering represent "ordinal numbers".

Gematria is an alphanumeric code of assigning a numerical value to a Hebrew or English name, word or phrase based on its letters. People who practice gematria believe that words with identical numerical values bear some relation to each other or to the number itself. The number may apply to nature, a person's age, the calendar year, or the like. A single word can yield multiple values depending on the cipher used.

Irenaeus was a Greek cleric noted for his role in guiding and expanding Christian communities in what is now the south of France and, more widely, for the development of Christian theology by combatting heresy and defining orthodoxy. Originating from Smyrna, now Izmir in Turkey, he had heard the preaching of Polycarp, who in turn was said to have heard John the Evangelist.

Greek is an independent branch of the Indo-European family of languages, native to Greece, Cyprus and other parts of the Eastern Mediterranean and the Black Sea. It has the longest documented history of any living Indo-European language, spanning more than 3000 years of written records. Its writing system has been the Greek alphabet for the major part of its history; other systems, such as Linear B and the Cypriot syllabary, were used previously. The alphabet arose from the Phoenician script and was in turn the basis of the Latin, Cyrillic, Armenian, Coptic, Gothic, and many other writing systems.

1,000,000, or one thousand thousand, is the natural number following 999,999 and preceding 1,000,001. The word is derived from the early Italian millione, from mille, "thousand", plus the augmentative suffix -one. It is commonly abbreviated as m or M; further MM, mm, or mn in financial contexts.