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  2. Visible spectrum - Wikipedia

    en.wikipedia.org/wiki/Visible_spectrum

    The spectral colors from red to violet are divided by the notes of the musical scale, starting at D. The circle completes a full octave, from D to D. Newton's circle places red, at one end of the spectrum, next to violet, at the other. This reflects the fact that non-spectral purple colors are observed when red and violet light are mixed.

  3. LGBTQ symbols - Wikipedia

    en.wikipedia.org/wiki/LGBTQ_symbols

    A purple hand symbol created in 2024. On October 31, 1969, sixty members of the Gay Liberation Front, the Committee for Homosexual Freedom (CHF), and the Gay Guerilla Theatre group staged a protest outside the offices of the San Francisco Examiner in response to a series of news articles disparaging people in San Francisco's gay bars and clubs.

  4. Red Hat Society - Wikipedia

    en.wikipedia.org/wiki/Red_Hat_Society

    The poem begins: “When I am an old woman, I shall wear purple, with a red hat which doesn't go and doesn't suit me.” Cooper wanted to encourage her friend to grow older in a playful manner. [ 3 ] Cooper repeated the gift to several other friends upon request, and eventually several of the women bought purple outfits and held a tea party on ...

  5. List of flags containing the color purple - Wikipedia

    en.wikipedia.org/wiki/List_of_flags_containing...

    Purple is one of the least used colors in vexillology and heraldry.Currently, the color appears in only five national flags: that of Dominica, Spain, El Salvador, Nicaragua, and Mexico, and one co-official national flag, the Wiphala (co-official national flag of Bolivia).

  6. Purple Rain (song) - Wikipedia

    en.wikipedia.org/wiki/Purple_Rain_(song)

    "Purple Rain" is a song by the American musician Prince and his backing band the Revolution. It is the title track from the 1984 album of the same name, which in turn is the soundtrack album for the 1984 film of the same name starring Prince, and was released as the third single from the album.

  7. Light-emitting diode - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode

    One of the challenges is the development of more efficient green LEDs. The theoretical maximum for green LEDs is 683 lumens per watt but as of 2010 few green LEDs exceed even 100 lumens per watt. The blue and red LEDs approach their theoretical limits. [citation needed] Multicolor LEDs offer a means to form light of different colors.

  8. Flag of Thailand - Wikipedia

    en.wikipedia.org/wiki/Flag_of_Thailand

    A red plain rectangular flag. c. 1782–1855: Civil ensign prior to 1855 c. 1782 – c. 1817: State and naval ensign decreed by Phutthayotfa Chulalok (Rama I) Red flag with a white chakra, presumably to represent the Chakri dynasty. c. 1817–1855: Change instituted by Phutthaloetla Naphalai (Rama II) Red flag with a white elephant inside the ...

  9. Colors of noise - Wikipedia

    en.wikipedia.org/wiki/Colors_of_noise

    [16] [17] That is, it is similar to pink noise, but with different spectral content and different relationships (i.e. 1/f for pink noise, while 1/f 2 for red noise, or an decrease of 6.02 dB per octave). In areas where terminology is used loosely, "red noise" may refer to any system where power density decreases with increasing frequency. [18]

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