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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. ∀.
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.
This is a list of emoticons or textual portrayals of a writer's moods or facial expressions in the form of icons. Originally, these icons consisted of ASCII art, and later, Shift JIS art and Unicode art. In recent times, graphical icons, both static and animated, have joined the traditional text-based emoticons; these are commonly known as ...
Without proper rendering support, you may see question marks, boxes, or other symbols. In typography, a star is any of several glyphs with a number of points arrayed within an imaginary circle. A commonly used star symbol is the asterisk.
Figure 1. Special-character links above edit window: Symbol group. Groups for the special-character links below the edit window are displayed one at a time; the default group is Insert, which includes punctuation and some other common symbols (see Figure 2 below), but another group may be shown if you have previously selected it. Click the down ...
Period-after-opening symbol (on cosmetics as 6M, 12M, 18M, etc.) U+2602 ☂ UMBRELLA - keep dry. U+2614 ☔ UMBRELLA WITH RAIN DROPS - keep dry. Japanese postal mark. ℮, the European estimated sign U+212E. Inventory tracking symbols. Barcode such as a Universal Product Code. QR code.
The CharInsert toolbar. To insert a dash or minus sign, use the toolbar below the edit box. Click where you want the character to be inserted, select "Insert" from the pull-down menu, and then: To insert an en dash (–), click on the first character (the shorter dash). To insert an em dash (—), click on the second character (the longer dash).
In contrast, a character entity reference refers to a character by the name of an entity which has the desired character as its replacement text. The entity must either be predefined (built into the markup language) or explicitly declared in a Document Type Definition (DTD). The format is the same as for any entity reference: &name;