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A dagger, or obelisk, , is a typographical symbol or glyph. The term "obelisk" derives from Greek (''obeliskos''), which means "little obelus"; from (''obelos'') meaning "roasting spit".〔(【引用サイトリンク】title=obelus )〕 It was originally represented by the - and ÷ symbols and was first used by the Ancient Greek scholars as critical marks in manuscripts. A double dagger or diesis, , is a variant with two handles. ==History== The dagger symbol originated from a variant of the obelus (plural: obeli), originally depicted by a plain line (-) or a line with one or two dots (÷). It represented an iron roasting spit, a dart, or the sharp end of a javelin, symbolizing the skewering or cutting out of dubious matter.〔〔〔 The obelus is believed to have been invented by the Homeric scholar Zenodotus as one of a system of editorial symbols. They were used to mark questionable or corrupt words or passages in manuscripts of the Homeric epics.〔 The system was further refined by his student Aristophanes of Byzantium, who first introduced the asterisk and used a symbol resembling a ⊤ for an obelus; and finally by Aristophanes' student, in turn, Aristarchus, from whom they earned the name of 'Aristarchian symbols'. While the asterisk (''asteriscus'') was used for corrective additions, the obelus was used for corrective deletions of invalid reconstructions. It was used when non-attested words are reconstructed for the sake of argument only, implying that the author did not believe such a word or word form had ever existed. Some scholars used the obelus and various other critical symbols, in conjunction with a second symbol known as the ''metobelos'' ("end of obelus"),〔(【引用サイトリンク】title=Hexapla )〕 variously represented as two vertically arranged dots, a γ-like symbol, a mallet-like symbol, or a diagonal slash (with or without one or two dots). They were used to indicate the end of a marked passage. It was used much in the same way by later scholars to mark differences between various translations or versions of the Bible and other manuscripts. The early Christian Alexandrian scholar Origen (c. 184 – 253 AD) used it as a method of indicating differences between different versions of the Old Testament in his ''Hexapla''.〔〔 Epiphanius of Salamis (''c''. 310–320 – 403) used both a horizontal slash or hook (with or without dots) and an upright and slightly slanting dagger to represent an obelus. St. Jerome (''c''. 347 – 420) used a simple horizontal slash for an obelus, but only for passages in the Old Testament.〔 He describes the use of the asterisk and the dagger as: "an asterisk makes a light shine, the obelisk cuts and pierces." Isidore of Seville (''c''. 560 – 636) described the use of the symbol as follows: "The obelus is appended to words or phrases uselessly repeated, or else where the passage involves a false reading, so that, like the arrow, it lays low the superfluous and makes the errors disappear... The obelus accompanied by points is used when we do not know whether a passage should be suppressed or not." Medieval scribes used the symbols extensively for critical markings of manuscripts.〔 In addition to this, the dagger was also used in notations in early Christianity, to indicate a minor intermediate pause in the chanting of Psalms, equivalent to the quaver rest notation. It is also used to indicate a breath mark when reciting, along with the asterisk, it is thus frequently seen beside a comma.〔(【引用サイトリンク】title=Obelisk, Obelus, Dagger )〕 In the sixteenth century, the printer and scholar Robert Estienne (also known as Stephanus in Latin and Stephens in English) used it to mark differences in the words or passages between different printed versions of the Greek New Testament (''Textus Receptus''). The obelus was also occasionally used as a mathematical symbol for subtraction. It was first used as a symbol for division by the Swiss mathematician Johann Rahn in his book ''Teutsche Algebra'' in 1659. This gave rise to the modern mathematical symbol ÷.〔(【引用サイトリンク】title=Math Words, pg 7 )〕 Due to the variations as to the different uses of the different forms of obeli, there is some controversy as to which symbols can actually be considered obeli. The lemniscus (÷) and its variant, the hypolemniscus (⨪), is sometimes considered to be different from other obeli. And obeli may have referred strictly only to the horizontal slash and the dagger symbols.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dagger (typography)」の詳細全文を読む スポンサード リンク
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