Alphabetical order is a system whereby character strings are placed in order based on the position of the characters in a specific ordering of an alphabet. It is one of the methods of collation. In ma
Flags of certain countries at the Élysée Palace in Paris for a peace conference regarding Libya, 2011. The national flags (other than those of the host, France, Europe to its left and UN to its right, which are at the centre) are arranged in French alphabetical order: Allemagne, Belgique, Canada, Danemark, Émirats Arabes Unis, Espagne, États-Unis, Grèce, Irak, Italie, Jordanie, Maroc, Norvège, Pays-Bas, Pologne, Qatar, Royaume-Uni. The last one,
Illuminated letter P at the beginning of Adelard of Bath's translation of Euclid's Elements, which starts "Punctum est illud cui pars non est" ('A point is that which has no part'). Geometry is shown personified as a woman, following Martianus Capella's De nuptiis Philologiae et Mercurii.
This is the Ulam spiral, which illustrates the distribution of prime numbers. The dark diagonal lines in the spiral hint at the hypothesized approximate independence between being prime and being a value of a quadratic polynomial, a conjecture now known as Hardy and Littlewood's Conjecture F.