Commercial Electric 3-Light Plug-In LED Black Puck Light Kit with CCT Changing (2700K/3000K/4000K)

3 (three) is a number, numeral and digit. It is the natural number following 2 and preceding 4, and is the smallest odd prime number and the only prime preceding a square number. It has religious and cultural significance in many societies.

Black is a color that results from the absence or complete absorption of visible light. It is an achromatic color, without hue, like white and grey. It is often used symbolically or figuratively to represent darkness. Black and white have often been used to describe opposites such as good and evil, the Dark Ages versus Age of Enlightenment, and night versus day. Since the Middle Ages, black has been the symbolic color of solemnity and authority, and for this reason it is still commonly worn by judges and magistrates.

Black was one of the first colors used by artists in Neolithic cave paintings. It was used in ancient Egypt and Greece as the color of the underworld. In the Roman Empire, it became the color of mourning, and over the centuries it was frequently associated with death, evil, witches, and magic. In the 14th century, it was worn by royalty, clergy, judges, and government officials in much of Europe. It became the color worn by English romantic poets, businessmen and statesmen in the 19th century, and a high fashion color in the 20th century. According to surveys in Europe and North America, it is the color most commonly associated with mourning, the end, secrets, magic, force, violence, fear, evil, and elegance.

Black is the most common ink color used for printing books, newspapers and documents, as it provides the highest contrast with white paper and thus is the easiest color to read. Similarly, black text on a white screen is the most common format used on computer screens. As of September 2019, the darkest material is made by MIT engineers from vertically aligned carbon nanotubes.

Commercial may refer to:

• a dose of advertising conveyed through media (such as radio or television)
  • Radio advertisement
  • Television advertisement
• (adjective for) commerce, a system of voluntary exchange of products and services
  • (adjective for) trade, the trading of something of economic value such as goods, services, information or money
• Two functional constituencies in elections for the Legislative Council of Hong Kong:
  • Commercial (First)
  • Commercial (Second)
• Commercial (album), a 2009 album by Los Amigos Invisibles
• Commercial broadcasting
• Commercial style or early Chicago school, an American architectural style
• Commercial Drive, Vancouver, a road in Vancouver, British Columbia, Canada
• Commercial Township, New Jersey, in Cumberland County, New Jersey

Light, visible light, or visible radiation is electromagnetic radiation that can be perceived by the human eye. Visible light spans the visible spectrum and is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz. The visible band sits adjacent to the infrared (with longer wavelengths and lower frequencies) and the ultraviolet (with shorter wavelengths and higher frequencies), called collectively optical radiation.

In physics, the term "light" may refer more broadly to electromagnetic radiation of any wavelength, whether visible or not. In this sense, gamma rays, X-rays, microwaves and radio waves are also light. The primary properties of light are intensity, propagation direction, frequency or wavelength spectrum, and polarization. Its speed in vacuum, 299792458 m/s, is one of the fundamental constants of nature. Like all types of electromagnetic radiation, visible light propagates by massless elementary particles called photons that represents the quanta of electromagnetic field, and can be analyzed as both waves and particles. The study of light, known as optics, is an important research area in modern physics.

The main source of natural light on Earth is the Sun. Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps. With the development of electric lights and power systems, electric lighting has effectively replaced firelight.

Plug, PLUG, plugs, or plugged may refer to:

• Plug, an insertive closure or stopper (plug)
  • Core plug, used to fill the casting holes on engines
  • Butt plug, a sex toy that is inserted into the rectum
  • Earplug for ear protection
  • Plug (sanitation), a stopper for a drainage outlet
• Plug (accounting), an unsupported adjustment to an accounting record
• Plug (fishing), a family of fishing lures
• Plug (horticulture), a planting technique
• Plug (jewellery), a type of jewellery worn in stretched piercings
• Fusible plug, a safety device in steam boilers
• Hair plug, hair that has undergone hair transplantation
• Mating plug, secretion used in the mating of some animal species
• Plug, a step in the manufacturing process for parts made of carbon-fiber-reinforced polymer
• Plug, a type of chewing tobacco made by pressing tobacco with syrup
• Plug, the central element of a Plug and feathers, a tool for splitting stone
• Plug computer, a type of small-form-factor computer
• Portland Linux/Unix Group (PLUG), a group of Linux enthusiasts in Portland, Oregon
• Product plug, or product placement in marketing
• Volcanic plug, a geological landform
• Wall plug, a fastener that allows screws to be fitted into drywall or masonry walls
• Plug (plumbing)
• Plug, a worthless horse

With or WITH may refer to:

• With, a preposition in English
• Carl Johannes With (1877–1923), Danish doctor and arachnologist
• With (character), a character in D. N. Angel
• With (novel), a novel by Donald Harrington
• With (album), a 2014 album by TVXQ
• With (EP), a 2021 EP by Nam Woo-hyun