Number symbolism consists of the many cultural associations—religious, philosophical, and aesthetic—with various numbers.

Atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus.

The number 7 is often considered lucky, and it has a definite mystique, perhaps because it is a prime number—that is, it cannot be obtained by multiplying two smaller numbers together.

4 days ago · The number e is an irrational number; that is, it cannot be expressed as the ratio of two integers. It is also a transcendental number, meaning that it is not the root of any nonzero …

Nov 21, 2025 · Infinity, the concept of something that is unlimited, endless, without bound. Three main types of infinity may be distinguished: the mathematical, the physical, and the …

Oct 29, 2025 · The number of the beast is usually referred to as 666, although the earliest extant written copy of Revelation gives 616. While the exact identity of the beast is contested, there …

Nov 7, 2025 · The General Conference on Weights and Measures defined the mole as this number for the International System of Units (SI) effective from May 20, 2019. The mole was …

Zero is both a number and a concept denoting the absence of quantity. It is represented by the symbol “0” and plays a foundational role in arithmetic, algebra, computing, and scientific …

Oxidation number, the total number of electrons that an atom either gains or loses in order to form a chemical bond with another atom. Each atom that participates in an oxidation-reduction …

Nov 5, 2025 · Chromosome number, precise number of chromosomes typical for a given species. In most sexually reproducing organisms, somatic cells are diploid, containing two copies of …