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A dagger (†, †, U+2020) is a typographical symbol or glyph. It is also called an obelus or obelos, from a Greek word meaning "roasting spit" or "needle", or obelisk, its diminutive (see obelisk). A double dagger (‡, ‡, U+2021) is a variant with two "handles", and is also called a diesis or Cross of Lorraine.

The symbol was first used in liturgical books of the Roman Catholic Church, marking a minor intermediate pause in the chanting of Psalm verses (the major intermediate pause was marked with an asterisk) or the point at which the chanting of the Psalm was taken up after an introductory antiphon whose words were identical with the opening words of the Psalm.

The dagger is used to indicate a footnote, in the same way an asterisk is. However, the dagger is only used as a second footnote when an asterisk is already used. Third footnote employs the double daggers. Additional footnotes are somewhat inconsistent and represented by a variety of symbols, e.g., parallels (||) and the pilcrow (¶), some of which are nonexistent in early modern typography. Partly due to this, in modern literature, superscript numerals are used in the place of pictorial symbols. Some texts use asterisks and daggers alongside superscripts, using the former for per-page footnotes and the latter for endnotes.

The dagger should not be confused with the "box drawings light vertical and horizontal" (┼, U+253C) nor palatal click (IPA: [ǂ], U+01C2).

Sometimes it is replaced in ASCII by a plus sign (+).

Since it also represents the Christian cross, in certain predominantly Christian regions, the mark is used in a text before or after the name of a deceased person or the date of death, as in Christian grave headstones. For this reason, it should not be used as a footnote mark next to the name of a living person. Generally, the symbol should only be used in this fashion for people who were Christians.^[1]

In European railway timetables, the dagger (Christian cross) is frequently used as a conventional sign meaning "Sundays and holidays".

On the London Underground, the dagger symbol is used as "points to remember".

In taxonomic nomenclature, the dagger symbol is used to denote extinct taxa.

In Mathematics and, more often, Physics, a dagger is used to denote the Hermitian adjoint of an operator; for example, A^† denotes the adjoint of A. This notation is sometimes replaced with an asterisk, especially in Mathematics. An operator is said to be Hermitian if A^† = A.

In textual criticism, and hence some editions of dated texts, daggers are used to enclose disputed text.

In chess notation, the dagger may be suffixed to a move to signify the move resulted in a check, and a double dagger is used to denote checkmate. This is a stylistic variation on the more common '+' (plus sign) for a check and '++' (double plus) or '#' (number sign) for checkmate.

In chemistry, the double dagger is used to indicate a transition state molecule.

On a cricket scorecard or team list, the dagger indicates the team's wicket-keeper[1]

The double dagger should not be confused with the cross of Lorraine or the patriarchal cross.

Dagger and double-dagger symbols in a variety of fonts, showing the differences between stylized and non-stylized characters

1. ^ (2002) Oxford Manual of Style. Oxford University Press, 683.