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propositional logic, Boolean algebra, first-order logic. ⊥ {\displaystyle \bot } denotes a proposition that is always false. The symbol ⊥ may also refer to perpendicular lines. The proposition. ⊥ ∧ P {\displaystyle \bot \wedge P} is always false since at least one of the two is unconditionally false. ∀.
A dagger, obelisk, or obelus†is a typographical markthat usually indicates a footnoteif an asteriskhas already been used.[1] The symbol is also used to indicate death (of people) or extinction (of species or languages).[2] It is one of the modern descendants of the obelus, a mark used historically by scholars as a critical or highlighting ...
The Cross of Saint Peter, also known as the Petrine Cross, is an inverted Latin cross traditionally used as a Christian symbol, but in recent times, it has also been used as an anti-Christian and Satanic symbol. In Christianity, it is associated with the martyrdom of Saint Peter. The symbol originates from the Catholic tradition that when ...
Nabla symbol. 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. [2][4][5][6][7] The nabla ...
Miscellaneous Symbols is a Unicode block (U+2600–U+26FF) containing glyphs representing concepts from a variety of categories: astrological, astronomical, chess, dice, musical notation, political symbols, recycling, religious symbols, trigrams, warning signs, and weather, among others.
The glyph of the up tack appears as an upside-down tee symbol, and as such is sometimes called eet (the word "tee" in reverse). [citation needed] Tee plays a complementary or dual role in many of these theories. The similar-looking perpendicular symbol ( , \perp in LaTeX, U+27C2 in Unicode) is a binary relation symbol used to represent:
An upside-down interrobang (combining ¿ and ¡, Unicode character: ⸘), suitable for starting phrases in Spanish, Galician and Asturian—which use inverted question and exclamation marks—is called an "inverted interrobang" or a gnaborretni (interrobang spelled backwards), but the latter is rarely used. [17]
On Japanese maps, a swastika (left-facing and horizontal) is used to mark the location of a Buddhist temple. The right-facing swastika is often referred to as the gyaku manji (逆卍, lit. "reverse swastika") or migi manji (右卍, lit. "right swastika"), and can also be called kagi jūji (鉤十字, literally "hook cross").