Nelson
A score of 111, either for a team or for an individual batsman. Superstition holds that this score is unlucky and more likely to lead to a dismissal, due to its resemblance to the three stumps of the wicket (as if the bails had been removed). Tradition holds that the bad luck may be averted if spectators stand on one leg. Scores of 222 and 333 are known as double Nelson and triple Nelson respectively; these are sometimes also considered unlucky. Nervous nineties
The period of a batsmans innings when their score is between 90 and 99. Many players bat nervously in this period because they are worried about getting out before they reach a century. The fielding captain often sets an attacking field to increase the psychological pressure. Some players are particularly prone to getting out in the nervous nineties. Nets
a pitch surrounded on three sides by netting, used by for practice by batsman and bowler. Net run rate (NRR) 
In a match, the average run rate scored by a team minus the average run rate scored against them. In a series, a teams NRR is (total runs scored) / (total overs received) – (total runs conceded) / (total overs bowled). New ball
In professional cricket, a new ball is used at the beginning of each innings. In timed matches, the fielding captain has the option of taking another new ball after 80 overs have passed.
It has been suggested that all cases of cancrum oris develop from pre-existing NUG, but this is not confirmed. Furthermore, the vast majority of cases of NUG and NUP will not progress to the more severe forms, even without treatment. References
J Lindhe, NP Lang, T Karring (editors) (2008) "Clinical periodontology and implant dentistry" 5th edition, Blackwell Munksgaard, pp. 413,459 
MG Newman, HH. Takei, PR Klokkevold, FA Carranza (editors) (2012) "Carranzas clinical periodontology" 11th edition, Elsevier/Saunders, p. 165