K-line

• K-line (spectrometry), one of two features in spectroscopy:
• Calcium K line, a Fraunhofer spectral line from ionised calcium
• K-line (x-ray), an x-ray peak in astronomical spectrometry
• K line, a term used in Internal conversion electron spectroscopy

• K-line (artificial intelligence) (Knowledge-line), a mental agent in artificial intelligence
• K-line (IRC), a server ban in IRC

• Candlestick chart, or K-line, a style of financial chart used to describe price movements of a security, derivative, or currency

• K line, the line marking the calculation point in ski jumping

• K (Broadway Brooklyn Local), earlier KK, discontinued in 1976
• K (Eighth Avenue Local), a defunct train service on the New York City Subway, which was known as the AA until 1985
• K Ingleside, a service of the San Francisco Municipal Railway sometimes called the K Line
• K Line (Los Angeles Metro), a light rail line in Los Angeles County, California
• K (Los Angeles Railway), defunct streetcar line in Los Angeles, California
• K Line, a Japanese shipping company
• K-Line, a model railway locomotive company
• K-Line bus operator in Yorkshire, England since rebranded as Tiger Blue
• Line K (Tren Interoceánico), a planned railway service in Mexico
• K-Line, part of the ISO 9141 on-board diagnostics vehicle network interface standard

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