HLSS

HLSS can refer to:

Half-Life Sound Selector, a program that allows users to play audio files using voice communication on games developed by Valve.
Heart Lake Secondary School, a high school in Brampton, Ontario, Canada
Hopscotch Lollipop Sunday Surprise, a 2001 album by The Frogs
School of Humanities, Languages and Social Sciences (UWE), Bristol

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