Polaris Type 3;[1] KN-26 under the U.S. naming convention)[2] is a North Korean two-stage, submarine-launched ballistic missile,[3] likely based on the same motor that powers the Pukguksong-2.

[5] The first information about Pukguksong-3 was released on 22 August 2017, when images of filament wound casing were shown with a larger diameter of 1.4 m (4.6 ft),[5] along with the official name of the missile, on a display in the background of a photo.

[4] At the 10 October 2020 parade commemorating the 75th anniversary of the founding of the Workers' Party of Korea, a new missile was displayed and was named as Pukguksong-4.

Unlike the Pukguksong-3, it was seen with a Korean People's Army Ground Force escort and the missile did not appear to have an actual separation mechanism for its two stages.

Also he mentioned that the letter 'ㅅ' may stand for 수중 (sujung, submarine, underwater) or 수상 (susang, on the water).

It shared the design of the previous two missiles, however with a pointed nose cone and longer payload shroud for a greater overall length.