Which component of fixer solution is commonly known as "hypo"?

Name: Which component of fixer solution is commonly known as "hypo"?
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Sodium thiosulfate is commonly known as "hypo" and is the main component of fixer solution used in photography to dissolve and remove any remaining silver halide crystals from the film or paper. Sodium sulfite is also used in fixer solution, but it is not commonly referred to as "hypo." Potassium alum and acetic acid are not components of fixer solution.

Which Component of Fixer Solution Is Commonly Known as "Hypo