double-struck
Outlined letter style
Double-struck describes a typographic style where letters appear as outlines with a vertical line through them, as if struck twice with a slight offset.
The style is most familiar from mathematical notation, where double-struck letters represent specific number sets: ℕ for natural numbers, ℤ for integers, ℝ for real numbers.
Also called blackboard bold because mathematicians drew letters this way on chalkboards to distinguish them from regular variables.
Symbols representing numbers and operations
- LaTeXTechnical document preparation system
- fontCharacter style set
- typefaceLettering style design
- character setDefined group of symbols
symbols · encoding · glyph · serif · letterform · chalkboard · academic · textbook
Forceful contact or consequence
- collisionForceful contact between objects
- recoilBackward force from discharge
- hammerTool for striking nails
- percussionSound through impact
consecutive · battered · pounded · beaten · contact · force · smacked · walloped
Hollow resonating instrument
- tollingSlow, solemn bell-ringing
- hourlyOnce each sixty minutes
- grandfather clockTall freestanding pendulum timekeeper
- carillonTuned bronze bell instrument
Westminster chimes · gong · resonance · timekeeping · pendulum · quarter hour · announcement
mathematical notation
Symbols representing numbers and operations
character set · symbols · encoding · glyph · serif · letterform · chalkboard · academic · textbook · set theory
impact
Forceful contact or consequence
- collisionForceful contact between objects
- recoilBackward force from discharge
- hammerTool for striking nails
percussion · consecutive · battered · pounded · beaten · contact · force · smacked · walloped · thwacked
bell
Hollow resonating instrument
- tollingSlow, solemn bell-ringing
- hourlyOnce each sixty minutes
- grandfather clockTall freestanding pendulum timekeeper
carillon · Westminster chimes · gong · resonance · timekeeping · pendulum · quarter hour · announcement