According to the search results, "glu" can refer to different things:
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Glutamic acid: "Glu" is a symbol for glutamic acid, which is an amino acid used to form proteins. In the body, it turns into glutamate, a chemical that helps nerve cells in the brain send and receive information from other cells. It may be involved in learning and memory.
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Glu Mobile: "Glu" is the name of a company headquartered in San Francisco that creates mobile games.
It is unclear what "glu" refers to in the context of "drizzle; mist" or "the distribution of light and shade in a picture".
