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Nabla may refer to any of the following: * the nabla symbol ∇ ** the vector differential operator, also called del, denoted by the nabla * Nabla, tradename of a type of rail fastening system (of roughly triangular shape) * ''Nabla'' (moth), a genus of moths * Nabla (instrument), the Greek word for a Phoenician stringed instrument after the triangular shape of which all of the above are named, reported as "nebel/nevel" in Hebrew sources. * Ranjan Daimary Ranjan Daimary alias D.R. Nabla (Ransaigra Nabla Daimary) is the founder president of the armed separatist outfit National Democratic Front of Boroland. Daimary initially founded a militant group named Bodo Security Force in October 1986. Later, ... or D. R. Nabla, an Indian militant See also * nambla {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nabla Symbol
The nabla symbol The nabla is a triangular symbol resembling an inverted Greek delta:Indeed, it is called ( ανάδελτα) in Modern Greek. \nabla or ∇. The name comes, by reason of the symbol's shape, from the Hellenistic Greek word for a Phoenician harp, and was suggested by the encyclopedist William Robertson Smith in an 1870 letter to Peter Guthrie Tait.Letter from Smith to Tait, 10 November 1870: My dear Sir, The name I propose for ∇ is, as you will remember, Nabla... In Greek the leading form is ναβλᾰ... As to the thing it is a sort of harp and is said by Hieronymus and other authorities to have had the figure of ∇ (an inverted Δ). Quoted in Oxford English Dictionary entry "nabla".Notably it is sometimes claimed to be from the Hebrew nevel (נֶבֶל)—as in the Book of Isaiah, 5th chapter, 12th sentence: "וְהָיָה כִנּוֹר וָנֶבֶל תֹּף וְחָלִיל וָיַיִן מִשְׁתֵּיהֶם וְאֵת פֹּעַל יְ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rail Fastening System
A rail fastening system is a means of fixing Rail profile, rails to railroad ties (North America) or sleepers (British Isles, Australasia, and Africa). The terms ''rail anchors'', ''tie plates'', ''chairs'' and ''track fasteners'' are used to refer to parts or all of a rail fastening system. The components of a rail fastening system may also be known collectively as other track material, or OTM for short. Various types of fastening have been used over the years. History and overview The earliest wooden rails were fixed to wooden sleepers by pegs through holes in the rail, or by nails. By the 18th century, cast iron rails had come into use, and also had holes in the rail itself to allow them to be fixed to a support. 18th century developments such as the flanged rail and fish bellied rail also had holes in the rail itself; when stone block sleepers were used the nails were driven into a wooden block which had been inserted into a recess in the block. The first chair for a rail is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nabla (moth)
''Nabla'' is a genus of moth in the family Geometridae The geometer moths are moth Moths are a group of insects that includes all members of the order Lepidoptera that are not Butterfly, butterflies. They were previously classified as suborder Heterocera, but the group is Paraphyly, paraphyleti .... ReferencesNatural History Museum Lepidoptera genus database Geometridae Geometridae genera {{Geometridae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nabla (instrument)
The nevel, nebel ( ''nēḇel''), was a stringed instrument used by the Phoenicians and the Israelites. The Greeks translated the name as ''nabla'' (νάβλα, "Phoenician harp").Athenaeus, ''Deipnosophistae'4.174/ref> A number of possibilities have been proposed for what kind of instrument the ''nevel'' was; these include the psaltery and the kithara, both of which are strummed instruments like the kinnor, with strings running across the sound box, like the modern guitar and zither. Most scholars believe the ''nevel'' was a frame harp, a plucked instrument with strings rising up from its sound box. The King James Version renders the word into English as psaltery or viol, and the Book of Common Prayer renders it lute. The word ''nevel'' has been adopted for "harp" in Modern Hebrew. In the Phoenician context The ''nabla'', mentioned by Athenaeus in his work "The Deipnosophists", is described as "an invention of the Phoenicians". He cites Sopater of Paphos who writes: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ranjan Daimary
Ranjan Daimary alias D.R. Nabla (Ransaigra Nabla Daimary) is the founder president of the armed separatist outfit National Democratic Front of Boroland. Daimary initially founded a militant group named Bodo Security Force in October 1986. Later, in 1994, Bodo Security Forced was renamed as National Democratic Front of Boroland. Education Ranjan Daimary belongs to an educated and rich family. Daimary's academic career is associated with noted school, college and university of Shillong, Meghalaya. Daimary completed his graduation in Political Science from St Anthony's College, and completed his Master's Degree in Political Science from North-Eastern Hill University (NEHU), Shillong, Meghalaya. Family & secret killing of family Ranjan Daimary's sister Lilawati Daimary, a school teacher, was killed by unidentified gunmen on 5 January 2010 that is widely believed as one of the incident of the Secret killings of Assam issue. Daimary's other sister Dr. Anjali Daimary is the chief o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
