Weaver Leather All-Purpose Pueblo Contoured Saddle Pad, 32 in. x 32 in., Indigo

Indigo is a term used for a number of hues in the region of blue. The word comes from the ancient dye of the same name. The term "indigo" can refer to the color of the dye, various colors of fabric dyed with indigo dye, a spectral color, one of the seven colors of the rainbow as described by Newton, or a region on the color wheel, and can include various shades of blue, ultramarine, and green-blue. Since the web era, the term has also been used for various purple and violet hues identified as "indigo", based on use of the term "indigo" in HTML web page specifications.

The word "indigo" comes from the Latin word indicum, meaning "Indian", as the naturally based dye was originally exported to Europe from India.

The Early Modern English word indigo referred to the dye, not to the color (hue) itself, and indigo is not traditionally part of the basic color-naming system.

The first known recorded use of indigo as a color name in English was in 1289.

Isaac Newton regarded indigo as a color in the visible spectrum, as well as one of the seven colors of the rainbow: the color between blue and violet; however, sources differ as to its actual position in the electromagnetic spectrum. Later scientists have concluded that what Newton called "blue" was what is now called cyan or blue-green; and what Newton called "indigo" was what is now called blue.

In the 1980s, programmers produced a somewhat arbitrary list of color names for the X Window computer operating system, resulting in the HTML and CSS specifications issued in the 1990s using the term "indigo" for a dark purple hue. This has resulted in violet and purple hues also being associated with the term "indigo" since that time.

Because of the Abney effect, pinpointing indigo to a specific hue value in the HSV color wheel is elusive, as a higher HSV saturation value shifts the hue towards blue. However, on the new CIECAM16 standard, the hues values around 290° may be thought of as indigo, depending on the observer.

Leather is a strong, flexible and durable material obtained from the tanning, or chemical treatment, of animal skins and hides to prevent decay. The most common leathers come from cattle, sheep, goats, equine animals, buffalo, pigs and hogs, ostriches, and aquatic animals such as seals and alligators.

Leather can be used to make a variety of items, including clothing, footwear, handbags, furniture, tools and sports equipment, and lasts for decades. Leather making has been practiced for more than 7,000 years and the leading producers of leather today are China and India.

Critics of tanneries claim that they engage in unsustainable practices that pose health hazards to the people and the environment near them.

Pueblo refers to the settlements and to the Native American tribes of the Pueblo peoples in the Southwestern United States, currently in New Mexico, Arizona, and Texas. The permanent communities, including some of the oldest continually occupied settlements in the United States, are called pueblos (lowercased).

Spanish explorers of northern New Spain used the term pueblo to refer to permanent Indigenous towns they found in the region, mainly in New Mexico and parts of Arizona, in the former province of Nuevo México. This term continued to be used to describe the communities housed in apartment structures built of stone, adobe, and other local material. The structures were usually multi-storied buildings surrounding an open plaza, with rooms accessible only through ladders raised and lowered by the inhabitants, thus protecting them from break-ins and unwanted guests. Larger pueblos were occupied by hundreds to thousands of Puebloan people.

Several federally recognized tribes have traditionally resided in pueblos of such design. Later Pueblo Deco and modern Pueblo Revival architecture, which mixes elements of traditional Pueblo and Hispano design, has continued to be a popular architectural style in New Mexico.

The term is now part of the proper name of some historical sites, such as Pueblo of Acoma.

Purpose is the end for which something is done, created or for which it exists. Purpose is an abiding intention to achieve a long-term goal that is both personally meaningful and makes a positive mark on the world. It is part of the topic of intentionality and goal-seeking behavior.

Related concepts and subjects:

• Goal, a desired result or possible outcome
• Intention, the state of intending something or the action intended
• Motivation, a driving factor for actions, willingness, and goals
• Determination or resolve
• Meaningful life — a life of purpose
• Purpose clause, in grammar a dependent adverbial clause expressing purpose
• Purpose of life, questions regarding the significance of living or existence in general
• Teleology, the philosophical attempt to describe things in terms of their apparent purpose or goal
• Teleonomy, the apparent purposefulness of structures and functions in living organisms

A saddle is a supportive structure for a rider of an animal, fastened to an animal's back by a girth. The most common type is equestrian. However, specialized saddles have been created for oxen, camels and other animals.

It is not known precisely when riders first began to use some sort of padding or protection, but a blanket attached by some form of surcingle or girth was probably the first "saddle", followed later by more elaborate padded designs. The solid saddle tree was a later invention, and though early stirrup designs predated the invention of the solid tree, the paired stirrup, which attached to the tree, was the last element of the saddle to reach the basic form that is still used today. Present-day saddles come in a wide variety of styles, each designed for a specific equestrianism discipline, and require careful fit to both the rider and the horse. Proper saddle care can extend the useful life of a saddle, often for decades. The saddle was a crucial step in the increased use of domesticated animals, during the Classical Era.

X, or x, is the twenty-fourth letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ex (pronounced ), plural exes.