Day/night noise level, previously known as Ldn. This is a 24-hour average hourly noise level with a 10 decibel (dB) penalty for nighttime noise events between 10 PM and 7 AM.

Day-Night Equivalent Sound Level (See also Ldn)

Day night loudness. A weighted average sound pressure level accounting for the variations in noise levels during a 24 hour period, which allows for additional sensitivity to nighttime noise.

Diffusion Nationale du Livre

Differential Non-linearity. A measure in LSB of the worst-case deviation of code widths from their ideal value of 1 LSB.

Discovery Nickel Limited

Domain Name Lookup. The process of looking up an IP address and getting its domain name.