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The nabla is a triangular symbol resembling an inverted Greek delta: [1] or ∇. The name comes, by reason of the symbol's shape, from the Hellenistic Greek word νάβλα for a Phoenician harp, [2] [3] and was suggested by the encyclopedist William Robertson Smith in an 1870 letter to Peter Guthrie Tait.
The letter compared with E/e, in fonts Arial, Times New Roman, Cambria, and Gentium Plus. Ǝ ǝ (turned E or reversed E) is an additional letter of the Latin alphabet used in African languages using the Pan-Nigerian alphabet. The minuscule is based on a rotated e and the capital form majuscule Ǝ, based on a reversed (mirrored) majuscule E.
N-shape, the shape that resembles the capital letter N (interchangeable with the Z-shape) O-shape, the shape that resembles the capital letter O. O-ring; P-shape, the shape that resembles the capital letter P. P-trap, a P-shaped pipe under a sink or basin; Pi-shape, the shape that resembles the Greek capital letter Π. Π topology in electronic ...
The opposite symbol (∨) is called a vel, or sometimes a (descending) wedge. Some authors who call the descending wedge vel often call the ascending wedge ac (the corresponding Latin word for "and", also spelled "atque"), keeping their usage parallel.
This is a list of sources of light, the visible part of the electromagnetic spectrum.Light sources produce photons from another energy source, such as heat, chemical reactions, or conversion of mass or a different frequency of electromagnetic energy, and include light bulbs and stars like the Sun. Reflectors (such as the moon, cat's eyes, and mirrors) do not actually produce the light that ...
Fortition is the opposite of lenition: a consonant mutation in which a consonant changes from one considered weak to one considered strong. Fortition is less frequent than lenition in the languages of the world, but word-initial and word-final fortition is fairly frequent.
For example, subscript letters on the baseline are quite rare, and many typefaces provide only a limited number of superscripted letters. Despite these differences, all reduced-size glyphs go by the same generic terms subscript and superscript , which are synonymous with the terms inferior letter (or number ) and superior letter (or number ...
Complementary antonyms are word pairs whose meanings are opposite but whose meanings do not lie on a continuous spectrum (push, pull). Relational antonyms are word pairs where opposite makes sense only in the context of the relationship between the two meanings (teacher, pupil). These more restricted meanings may not apply in all scholarly ...