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What does HL stand for?

HL stands for Hydrogen Line

This definition appears very rarely and is found in the following Acronym Finder categories:

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We have 67 other meanings of HL in our Acronym Attic

Samples in periodicals archive:

According to Burnell, the astronomers have covered the frequency most likely to be used for an extraterrestrial communication, saying that if there was to be a communication it would be at what they call the Hydrogen Line - 21cm wavelength, which has been well-covered for years.
A sampling of topics: the microstructure of a sunspot penumbra, penumbral moving magnetic features, SOLIS-VSM solar vector magnetograms, multigrid methods for polarized radiative transfer, tunable narrow-band filter for imaging polarimetry, the diffraction limited spectro-polarimeter, a brief overview of the Second Solar Spectrum, polarizability factors for molecular bands, spectro-polarimetry of cool stars, molecular diagnostics of the internal structure of starspots and sunspots, and the effect of turbulent electric fields on the scattering polarization of hydrogen lines.
These include extreme ultraviolet (EUV) spectroscopy of the plasma produced by the catalysis process, characteristic emission from catalysis and the hydride ion products, lower-energy hydrogen emission, plasma formation, atomic hydrogen line broadening, inverted hydrogen lines, elevated electron temperature, anomalous plasma afterglow duration, power generation, and analysis of chemical compounds.