black triangle
Shadowed three-sided shape
A black triangle is a symbol with several distinct meanings depending on context.
In Nazi concentration camps, it marked prisoners classified as "asocial"—including Roma, the homeless, and lesbians.
Some lesbian and disability rights groups have reclaimed it as a symbol of identity and solidarity.
In pharmacology, a black triangle on medication packaging indicates a drug under additional safety monitoring.
Black triangle also describes a category of UFO sightings—large, silent, triangular craft reported since the 1980s: Witnesses described a black triangle hovering over the highway.
Alert about danger
- cautionCareful attention to risk
- dangerExposure to harm
- biohazardDangerous living organism risk
- radioactiveEmitting nuclear decay particles
toxic · flammable · corrosive · explosive · poison · high-voltage · defective · unsafe
Filled-in outline shape
- contrastNotable difference between things
- monochromeSingle-color rendering
- starkSevere and unadorned
- boldCourageous and daring
graphic · minimalist · icon · logo · arrow · pointer · design · symbol
Point where edges converge
- isoscelesTwo sides match
- scaleneAll sides unequal
- equilateralHaving all sides congruent
- acuteIntensely severe or perceptive
obtuse · right-angle · hypotenuse · sides · angle · perimeter · polygon · plane
North Atlantic island group
- enigmaSomething hard to fathom
- unknownNot yet discovered
- UFOUnidentified aerial craft
- anomalyDeparture from the expected
paranormal · cryptic · conspiracy · unexplained · disappearance · legend · supernatural · phenomenon
German fascist party member
- HolocaustNazi genocide of Jews
- RomaTraveler ethnic group
- asocialAvoiding interaction with others
- prisonerConfined criminal detainee
badge · deportation · discrimination · genocide · victim · memorial · history · oppression
warning
Alert about danger
radioactive · toxic · flammable · corrosive · explosive · poison · high-voltage · defective · unsafe · prohibited
silhouette
Filled-in outline shape
- contrastNotable difference between things
- monochromeSingle-color rendering
- starkSevere and unadorned
bold · graphic · minimalist · icon · logo · arrow · pointer · design · symbol · marker
vertex
Point where edges converge
- isoscelesTwo sides match
- scaleneAll sides unequal
- equilateralHaving all sides congruent
acute · obtuse · right-angle · hypotenuse · sides · angle · perimeter · polygon · plane · Euclidean
Bermuda
North Atlantic island group
anomaly · paranormal · cryptic · conspiracy · unexplained · disappearance · legend · supernatural · phenomenon · sighting
Nazi
German fascist party member
prisoner · badge · deportation · discrimination · genocide · victim · memorial · history · oppression · identification
- Holocaust symbolsyellow star, striped uniform, gas chamber, cattle car, guard tower
- spacecraftspacecraft, starships, spaceship, Voyager 1, rocket ships
black, triangle, blacks, blacker, blackest, blacken, blackened, blackening, blackness