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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 inverted pyramid method visualised. The inverted pyramid is a metaphor used by journalists and other writers to illustrate how information should be prioritised and structured in prose (e.g., a news report).
The section sign (§) is a typographical character for referencing individually numbered sections of a document; it is frequently used when citing sections of a legal code. [1]
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.
Back slang is thought to have originated in Victorian England. It was used mainly by market sellers, such as butchers and greengrocers, for private conversations behind their customers' backs and to pass off lower-quality goods to less-observant customers. [1]
Upside-down marks, simple in the era of hand typesetting, were originally recommended by the Real Academia Española (Royal Spanish Academy), in the second edition of the Ortografía de la lengua castellana (Orthography of the Castilian language) in 1754 [3] recommending it as the symbol indicating the beginning of a question in written Spanish—e.g. "¿Cuántos años tienes?"
Reverse-contrast "Italian" type in an 1828 specimen book by the George Bruce company of New York. [1] Shown below it is a "fat face" design, a type also popular in early 19th century printing.
According to Florian Cajori in A History of Mathematical Notations, Johann Rahn used both the therefore and because signs to mean "therefore"; in the German edition of Teutsche Algebra (1659) the therefore sign was prevalent with the modern meaning, but in the 1668 English edition Rahn used the because sign more often to mean "therefore".