Writing and Printing
Blackboard bold
Blackboard bold is a style of writing bold symbols on a blackboard by doubling certain strokes, commonly used in mathematical lectures, and the derived style of typeface used in printed mathematical texts. The style is most commonly used to represent the number sets N {\displaystyle \mathbb {N} } (natural numbers), Z {\displaystyle \mathbb {Z} } (integers), Q {\displaystyle \mathbb {Q} } (rational numbers), R {\displaystyle \mathbb {R} } (real numbers), and C {\displaystyle \mathbb {C} } (complex numbers). To imitate a bold typeface on a typewriter, a character can be typed over itself (called double-striking); symbols thus produced are called double-struck, and this name is sometimes adopted for blackboard bold symbols, for instance in Unicode grapheme names. In typography, a typeface with characters that are not solid is called inline, handtooled, or open face.
Also on this shelf
Editing.
Historiography in the Middle Ages.
See also
- ▸History of Germany (1945–1990)
- ▸Holy Trinity Church, Dorchester
- ▸Albanian Declaration of Independence
Text from Wikipedia; plate via Wikimedia Commons. Text CC BY-SA 4.0; plate freely licensed (see Commons). Source record. Images and catalogue data are reproduced from open-access collections.