An inuksuk (plural inuksuit)  (from the Inuktitut: ᐃᓄᒃᓱᒃ, plural ᐃᓄᒃᓱᐃᑦ; alternatively inukshuk in English or inukhuk in Inuinnaqtun) is a stone landmark or cairn built by humans, used by the Inuit, Inupiat, Kalaallit, Yupik, and other peoples of the Arctic region of North America. These structures are found from Alaska to Greenland. This region, above the Arctic Circle, is dominated by the tundra biome and has areas with few natural landmarks.
The inuksuk may have been used for navigation, as a point of reference, a marker for travel routes, fishing places, camps, hunting grounds, places of veneration, drift fences used in hunting  or to mark a food cache. The Inupiat in northern Alaska used inuksuit to assist in the herding of caribou into contained areas for slaughter. Varying in shape and size, the inuksuit have longtime roots in the Inuit culture.
Historically, the most common type of inuksuk is a single stone positioned in an upright manner. There is some debate as to whether the appearance of human- or cross-shaped cairns developed in the Inuit culture before the arrival of European missionaries and explorers. The size of some innaguait suggest that the construction was often a communal effort.
The word inuksuk means "something which acts for or performs the function of a person". The word comes from the morphemes inuk ("person") and -suk ("ersatz" or "substitute"). It is pronounced inutsuk in Nunavik and the southern part of Baffin Island (see Inuit phonology for the linguistic reasons). In many of the central Nunavut dialects, it has the etymologically related name inuksugaq (plural: inuksugait).
Despite the predominant English spelling as inukshuk, both the Government of Nunavut and the Government of Canada through Aboriginal Affairs and Northern Development Canada are promoting the Inuit-preferred spelling inuksuk.
A structure similar to an inuksuk but meant to represent a human figure, called an inunnguaq (ᐃᓄᙳᐊᖅ, "imitation of a person", plural inunnguat), has become widely familiar to non-Inuit. However, it is not the most common type of inuksuk. It is distinguished from inuksuit in general.
Inuksuit continue to serve as an Inuit cultural symbol. For example, an inuksuk is shown on the flag and coat of arms of the Canadian territory of Nunavut, and the flag of Nunatsiavut. The high school in Iqaluit is named Inuksuk High School after the landmarks.
Inuksuit—particularly, but not exclusively, of the inunnguaq variety—are also increasingly serving as a mainstream Canadian national symbol. In 1999 Inukshuk was the name for the International Arctic Art & Music Project of ARBOS in the Canadian provinces of Québec, Ontario, Nunavik, and Nunavut; and in Greenland, Austria, Denmark and Norway.
On July 13, 2005, Canadian military personnel erected an inuksuk on Hans Island, along with a plaque and a Canadian flag, as part of Canada's longstanding dispute with Denmark over the small Arctic island. The markers have been erected throughout the country, including a nine-metre-high inuksuk that stands in Toronto on the shores of Lake Ontario. Located in Battery Park, it commemorates the World Youth Day 2002 festival that was held in the city in July 2002.
Artisan Alvin Kanak of Rankin Inlet, Northwest Territories (now in the territory of Nunavut), created an inuksuk as a gift to the city for Expo 86. The land has since been donated to the city, and is now a protected site.
An inunnguaq is the basis of the logo of the 2010 Winter Olympics designed by Vancouver artist Elena Rivera MacGregor. Its use in this context has been controversial, both among the Inuit and the First Nations of British Columbia. Although the design has been questioned, people believe it pays tribute to the inuksuk that stands at Vancouver's English Bay. Friendship and the welcoming of the world are the meanings of both the English Bay structure and the 2010 Winter Olympics emblem.
The Vancouver 2010 logo and the construction of inuksuit around the world have led to increasing recognition of them. There are five authentic inuksuit which were donated—wholly or in part—by the government of Canada: in Brisbane, Australia; Monterrey, Mexico; Oslo, Norway; Washington D.C., United States; and Guatemala City.
The most recent Canadian-donated inuksuk was built in Monterrey in October 2007 by the Inuvialuit artist Bill Nasogaluak. The sculpture was presented to the people of the northern state of Nuevo León as a gift from the Monterrey chapter of the Canadian Chamber of Commerce in Mexico and the Government of Canada, to mark the chamber’s 10th anniversary in the city. The sculpture stands over the Santa Lucía Riverwalk. Nasogaluak, of Tuktoyaktuk, personally chose the rocks for the structure from a local quarry near Monterrey. The inuksuk contains two rocks which the artist took to Mexico from Canada, one from the high Arctic and another from his home town of Toronto. Together they form the inuksuk’s heart.
Officials in various wilderness parks throughout Canada routinely dismantle inuksuit constructed by hikers and campers, for fear that they could misdirect park visitors from the cairns and other markers that indicate hiking trails. The practice of erecting inuksuit in parks has become so widespread that Killarney Provincial Park, on the north shore of Ontario's Georgian Bay, issued a notice in 2007 urging visitors to "stop the invasion" of inuksuit.
A large number of inuksuit have been built in some areas along the Trans-Canada Highway, including Northern Ontario. In 2010, a journalist from Sudbury's Northern Life counted 93 inuksuit along Highway 69 between Sudbury and Parry Sound. The journalist successfully tracked down a person who had built two inuksuit along the route; he attributed his action to having had a "fill the dreams moment where I needed to stop and do it" while driving home from a family funeral.
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- Peter Irniq, "The Ancestral Inuksuk", Naniiliqpita Magazine, spring 2006, p. 18-19.
- Places of Power - essay and photographs of inuksuit
- Ilanaaq – Vancouver 2010 Olympic Winter Games Emblem
- CBC News - Vancouver Olympic emblem comes under fire
- Canadian Heritage Minute video about the inuksuk
- Scott Heyes, "Protecting the authenticity and integrity of inuksuit within the arctic milieu", Études/Inuit/Studies, Volume 26, numéro 2, 2002, p. 133-156.
- Nelson Graburn, "Inuksuk: Icon of the Inuit of Nunavut" Études/Inuit/Studies, Volume 28, numéro 1, 2004, p. 69-82
- 2010 Olympic inuksuk snow sculpture from CTV.ca My News