A
A, or a, is the first letter and the first vowel of the modern English alphabet and the ISO basic Latin alphabet. Its name in English is a (pronounced / ˈ eɪ /), plural aes. It is similar in shape to the Ancient Greek letter alpha, from which it derives. The uppercase version consists of the two slanting sides of a triangle, crossed in the middle by a horizontal bar. A battery, a vacuum tube filament type battery; A battery (size), a standard battery size Anode, an electrode; A, historical symbol for chemical element argon, currently Ar; The center of a hexagonal face of the Brillouin zone of a hexagonal lattice, in physics; Arts and media Books "A", a major poem by twentieth century author Louis Zukofsky; a, A Novel, by twentieth century artist Andy Warhol
A definition, not any particular or certain one of a class or group: a man; a chemical; a house. See more. With fresh material, taxonomic conclusions are leavened by recognition that the material examined reflects the site it occupied; a herbarium packet gives one only a small fraction of the data desirable for sound conclusions. Herbarium material does not, indeed, allow one to extrapolate safely: what you see is what you get
