The bell shaped symmetrical curve used in statistical analysis to generate the relative frequency of occurrence of natural events.

Detonator timing may be normally distributed at the average, although due to manufacturing it is more likely to be skewed to a shorter delay.

A multiple combinations of oxides of nitrogen (N2O, NO, NO2, N2O4, N2O3, N2O5) with nitrogen dioxide (NO2) being the principal hazardous nitrous gas.