POCl3 is commonly called phosphorus oxychloride or phosphoryl chloride.
In more detail, POCl3 is an inorganic compound with the formula POCl3. It exists as a colorless liquid at room temperature and pressure. The compound is also known to fume in moist air. The two common names accurately describe its composition and structure:
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Phosphorus oxychloride: This name directly indicates that the compound consists of phosphorus, oxygen, and chlorine.
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Phosphoryl chloride: This name refers to the phosphoryl group (PO) bonded to three chlorine atoms.
Therefore, both phosphorus oxychloride and phosphoryl chloride are correct and frequently used names for POCl3.
