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Hospital emergency codes are coded messages often announced over a public address system of a hospital to alert staff to various classes of on-site emergencies. The use of codes is intended to convey essential information quickly and with minimal misunderstanding to staff while preventing stress and panic among visitors to the hospital.
A rainbow is a decomposition of white light into all of the spectral colors. Laser beams are monochromatic light, thereby exhibiting spectral colors. A spectral color is a color that is evoked by monochromatic light, i.e. either a spectral line with a single wavelength or frequency of light in the visible spectrum, or a relatively narrow spectral band (e.g. lasers).
Modern color theory uses either the RGB additive color model or the CMY subtractive color model, and in these, the complementary pairs are red–cyan, green–magenta (one of the purples), and blue–yellow. In the traditional RYB color model, the complementary color pairs are red–green, yellow–purple, and blue–orange.
Each color, pattern, and design has its own specific meaning: for instance, the Philly Pride flag has two extra stripes, one black and one brown, to highlight people of color in the LGBTQ+ community.
The blue sky and green vegetables were considered shades of a single color which could even include black as its darkest hue in some contexts. Modern Standard Mandarin makes the blue-green distinction using lǜ (绿; 綠 'leafy') for green and lán (蓝; 藍 'indigo') for blue. Qīng was associated with health, prosperity, and harmony.
The color Japanese violet is shown at right. This is the color called "violet" in the traditional Japanese colors group, a group of colors in use since beginning in 660 CE in the form of various dyes that are used in designing kimono. [21] [22] The name of this color in Japanese is sumire-iro, meaning "violet color".
The conventional gradient colors of the rainbow symbol. ROYGBIV is an acronym for the sequence of hues commonly described as making up a rainbow: red, orange, yellow, green, blue, indigo, and violet. When making an artificial rainbow, glass prism is used, but the colors of "ROY-G-BIV" are
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.