Nordic-style larp, or Nordic Larp, is a term used to describe a tradition of larp game design that emerged in the Nordic countries.
Nordic Larp Book
This is the definition used by the Nordiclarp.org websites. It's less of an academic definition and more meant as a statement to gather the scene around it in an inclusive manner. There is a longer explanation of the term at the source link.
Nordic larp is a term for shared larp traditions in the Norway, Sweden, Denmark and Finland. What sets the Nordic larp traditions apart from others is a strong emphasis on collaboration and collective creation, unobtrusive rules, as well as a rich variety of play styles and settings sometimes including heavy themes.
Jaakko Stenros 2013 Nordic Larp Talk Definition
A larp that is influenced by the Nordic Larp tradition or contributes to the ongoing Nordic larp discourse.
For some this might seem to loose. As Stenros puts it:
This definition may seem disappointing, or even like a cop out. It does not arm you with analytical tools that you could use, disconnected from larp practice, to identify a Nordic Larp. But Nordic Larp is not a set of instructions. It is not even a coherent design philosophy, though that is a fairly common claim online. It is a movement.
To perceive Nordic Larp as brand. Stenros tried to confine it to a 48 word brand statement.
A tradition that views larp as a valid form of expression, worthy of debate, analysis and continuous experimentation, which emerged around the Knutepunkt convention. It typically values thematic coherence, continuous illusion, action and immersion, while keeping the larp co-creative and its production uncommercial. Workshops and debriefs are common.
Nordic Larp introduction
Nordic Larp defintion