One originates from the Old English word an, derived from the Germanic root *ainaz, from the Proto-Indo-European root *oi-no- (meaning "one, unique").
Linguistically, one is a cardinal number used for countin… See more

Among the earliest known record of a numeral system, is the Sumerian decimal-sexagesimal system on clay tablets dating from the first half of the third millennium BCE. The Archaic Sumerian numerals for 1 and 60 bot… See more

Mathematically, the number 1 has unique properties and significance. In normal arithmetic (algebra), the number 1 is the first natural number after 0 (zero) and can be used to make up all other integers (e.g., ; ; etc.). The p… See more

In digital technology, data is represented by binary code, i.e., a base-2 numeral system with numbers represented by a sequence of 1s and 0s. Digitised data is represented in physical devices, such as computers, as pulses of el… See more

• Dimensionless quantities are also known as quantities of dimension one.
• Hydrogen, the first element of the periodic table, has an atomic number of 1.
• Group 1 of the periodic table consists of the alkali metals.… See more