Question: What is the abbreviation of the passage discovered by Hudson and Button?

Context paragraphs:
Thomas Button: Sir Thomas Button (died April, 1634) was a Welsh officer of the Royal Navy, notable as an explorer who in 1612–1613 commanded an expedition that unsuccessfully attempted to locate explorer Henry Hudson and to navigate the Northwest Passage.

Lakes to Locks Passage: The Lakes to Locks Passage is a scenic byway in northeastern New York in the United States and in southern Quebec in Canada.  The byway unifies the interconnected waterway of the upper Hudson River, Champlain Canal, Lake George, and Lake Champlain; this waterway is the core of North America’s first "super-highway" between upstate New York and the Canadian province of Quebec.  The initiatives of the Lakes to Locks Passage aim to unify the byway corridor as a single destination.  The US portion of the passage is a New York State Scenic Byway, a National Scenic Byway, and an All-American Road.

22P/Kopff: Comet Kopff or 22P/Kopff is a periodic comet in the Solar System.  Discovered on August 23, 1906, it was named after August Kopff who discovered the comet.  The comet was missed on its November 1912 return, but was recovered on its June 1919 return.  The comet has not been missed since its 1919 return and its last perihelion passage was on May 25, 2009.  Close approaches to Jupiter in 1938 and 1943 decreased the perihelion distance and orbital period.  22P/Kopff’s next perihelion passage is 18 March 2022.

Northwest Passage: The Northwest Passage (abbreviated as NWP) is, from the European and northern Atlantic point of view, the sea route to the Pacific Ocean through the Arctic Ocean, along the northern coast of North America via waterways through the Canadian Arctic Archipelago.  The eastern route along the Arctic coasts of Norway and Siberia is accordingly called Northeast Passage (NEP).

Lama Passage: Lama Passage, sometimes referred to as Lama Pass, is a strait on the Central Coast of British Columbia, Canada, between Denny, Campbell and Hunter Islands.  It is part of the Inside Passage shipping route, connecting Seaforth Channel with Fisher Channel.  It was named for a Hudson's Bay Company brigantine, the "Lama", under Captain McNeill (namesake of Port McNeill), which with another HBC vessel, the "Dryad" under Captain Kipling, brought building materials and stores from Fort Vancouver for the founding of Fort McLoughlin in 1833.

Snape Island: Snape Island is an uninhabited island in Qikiqtaaluk Region, Nunavut, Canada.  Located in Hudson Bay, it is a member of the Belcher Islands group.  It closes Omarolluk Sound on its southwestern side.  Rock Passage at its north end separates it from the Mukpollo Peninsula of Flaherty Island, and the Narrow Passage at its southeast end separates it from O'Leary Island.

Upper Hudson River Valley: The northern portion of the Hudson River valley in Upstate New York, generally that region extending from the first town below the headwaters of the Hudson River at North River to the last substantive waterfall preventing the passage of vessels at Fort Edward.  Downstream from Fort Edward, northbound boat traffic exits the Hudson River onto the Champlain Canal.

Murder of Jason Hudson: The murder of Jason Hudson occurred on October 24, 2008, when 29-year-old Jason Hudson and his 57-year-old mother, Darnell Donerson, were discovered shot to death inside Donerson's home in Chicago, Illinois.  The victims were the brother and mother of singer Jennifer Hudson.  Jennifer's seven-year-old nephew Julian King, the son of her elder sister Julia Hudson, was initially reported missing and an AMBER Alert was issued; Julian King's body was found on October 27 in Chicago's West Side area, in a parked car matching the AMBER Alert description.  Autopsy results indicated that Julian King's death was due to "multiple gunshot wounds."  A pistol found in a West Side vacant lot was confirmed as the murder weapon by Chicago police.

O'Leary Island: O'Leary Island is an uninhabited island in Qikiqtaaluk Region, Nunavut, Canada.  Located in Hudson Bay, it is a member of the Belcher Islands group.  It lies at the southeast end of Omarolluk Sound between Ridge Passage to the north and Narrow Passage to its south; Broomfield Island runs parallel to its east side.  Other islands in the immediate vicinity include:

Button Islands: The Button Islands are located in the Canadian Arctic Archipelago in the territory of Nunavut.  They are surrounded by Ungava Bay, Hudson Strait, Labrador Sea, and they are on the north side of Gray Strait.  The Button Islands measure 51 km2 .

Supporting paragraphs: Thomas Button Northwest Passage
Answer: NWP