DNL, dnl, or similar, may refer to:

• dnL, a short-lived soft drink produced by Cadbury Schweppes Americas Beverages
• Day-Night Average Sound Level, a measure of average noise level over a day
• Det Norske Luftfartsselskap, one of the four Scandinavian airlines merged to produce Scandinavian Airlines System (SAS)
• Differential nonlinearity error, in electronics and digital signal processing
• Discard to next line, a comment delimiter in the m4 macro language

dnL was the name of a Soft drink produced by Cadbury Schweppes Americas Beverages in the United States. The Day-Night Average Sound Level (Ldn or DNL is the average noise level over a 24 hour period Det Norske Luftfartselskap, or DNL The Norwegian Airline Company was Norway's flag carrier between 1933 and 1948 A differential Nonlinearity or differential Non-linearity (acronym DNL) is a term describing the deviation between two adjacent points m4 is a General purpose macro processor designed by Brian Kernighan and Dennis Ritchie.

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