A red triangle (upright 🔺 or 🔻 inverted) or red wedge is used as a symbol with a variety of meanings, including:

• Red triangle (badge), anti-fascist symbol partly derived from a Nazi concentration camp badge worn by political prisoners
• Red triangle (Channel 4), British television content warning system symbol
• Red triangle (family planning), the symbol for family planning health and contraception services
• Red triangle (Palestinian symbol), a symbol used by al-Qassam (militant wing of Hamas) in Palestine and pro-Palestinian protesters worldwide
• Donald Trump 2020 presidential campaign § Red triangle – advertisements banned on Facebook for using a red triangle symbol (see also: Trump 2020 § Political positions)

• Red triangle emoji (see also: list of emojis)

The dictionary definition of 🔻 U+1F53B at Wiktionary

• Unicode block: Miscellaneous Symbols and Pictographs

U+1F53A 🔺 "UP-POINTING RED TRIANGLE"

U+1F53B 🔻 "DOWN-POINTING RED TRIANGLE"

The red wedge from El Lissitzky's 1919 poster Beat the Whites with the Red Wedge has been used in many artworks and political symbols.

• The Red Wedge – 1918 sculpture by Nikolai Kolli (an earlier artwork)
• Red Wedge – British left-wing musical collective of the 1980s

• Network of Communists – Italian political network, founded in 1998
• Former logo of Revolutionary Left (Spanish: Izquierda Revolucionaria)
• Searchlight (magazine) – British magazine
• Organisation of Communist Internationalists [zh] (Russian: Организация Коммунистов Интернационалистов)

An upward-pointing red triangle has been used to represent:

• Bass Brewery's "iconic red triangle" trademark, England's first registered trademark
• Delta Air Lines' logo

• Republican Guard (Iraq) – Republican Guard Forces Command insignia
• Strafbataillon – Military penal unit of the Wehrmacht
• United States Coast and Geodetic Survey – Former U.S. government scientific agency

• A symbol on the Brazilian state flag of Minas Gerais

• 19th Century symbol for the eight-hour workday

Further: Red triangle (badge) § Eight-hour workday

• National Mobilization – Political party in Brazil

• The alchemical symbol for Fire (classical element)
• Warning triangle – Marker used to warn motorists about temporary road hazards

A downward-pointing red triangle has been used to represent:

• BJ's Restaurants – American restaurant chain
• Canadian Tire – Canadian retail company
• Manifold System – Geographic information system software
• Alvis Car and Engineering Company

• YMCA – Worldwide youth organization

• Antifaschistisches Infoblatt – Antifascist magazine in Germany

• Association of Persecutees of the Nazi Regime – Federation of Antifascists – Political confederation in Germany (VVN-BdA)
• Associazione nazionale ex deportati nei campi nazisti  [it]
• Committee of Antifascist Resistance Fighters – Organization in East Germany, 1953–1990
• Liberté chérie – Masonic Lodge

• 3rd (UK) Division – Armoured division of the British Army
• The Military Media [ar] (الإعلام العسكري) logo of the Qassam Brigades in Palestine

• Auschwitz Cross (Polish WWII medal)
• Political Prisoner's Cross 1940–1945 (Belgian WWII medal)

• Black triangle (disambiguation)
• Red star (disambiguation)
• White Terror (disambiguation)

• Brown triangle – used to mark victims of the Romani Holocaust
• Pink triangle – Symbol for the LGBTQIA+ community
• LGBTQ symbols § Triangle badges of Nazi Germany
• P (Nazi symbol) – Sign for Polish workers during the NS-Regime in Nazi Germany
• Purple triangle – Badge used in Nazi concentration camps to identify Jehovah's Witnesses
• Traffic warning sign – Sign that warns people for a risk or danger