Jy may refer to:
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Jansky
The jansky (symbol Jy, plural ''janskys'') is a non- SI unit of spectral flux density, or spectral irradiance, used especially in radio astronomy. It is equivalent to 10−26 watts per square metre per hertz.
The ''flux density'' or ''mono ...
(symbol Jy), non-SI unit of spectral electromagnetic flux density in radio astronomy
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JY cell line, Epstein-Barr virus (EBV)-immortalised b cell lymphoblastoid line
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