GBP/NOK measures the British pound against the Norwegian krone, or how many kroner one pound will buy. It is a cross rate, traded directly rather than through the US dollar, and it sits among the thinner-traded crosses, so spreads are wide and prices can move in larger jumps. The pair has no common nickname.
The British pound is the base currency and the Norwegian krone the quote currency, so a quote of 13.6000 means one pound is worth 13.6000 kroner. A rising price means the pound is strengthening against the krone, a falling price the reverse. You trade GBP/NOK as a forex CFD, betting on the price rather than buying kroner outright: go long if you expect the pound to rise, short if you expect it to fall. Moves are counted in pips at the fourth decimal place, and your result is the pips gained or lost multiplied by your position size.
The krone side is dominated by crude oil, since Norway is a significant oil exporter, and by Norges Bank's rate decisions, while the pound side turns on the Bank of England and UK data. Because liquidity in this cross is thinner than in the majors, oil-price swings and risk-sentiment shocks can produce outsized moves, and the wider spreads make timing and position sizing matter more than on heavily traded pairs.
Say GBP/NOK is trading at 13.6000 and you expect the pound to strengthen against the krone, so you buy one standard lot (100,000 British pounds). Each pip is worth 10 NOK, so a 100-pip rise to 13.7000 gives:
100 √ó 10 = 1,000 NOK (about $93)
A 100-pip fall to 13.5000 would instead cost 1,000 NOK. Because you trade on leverage, you post only a fraction of the contract value as margin, which magnifies both your gain and your loss.