This query is incomplete and ambiguous. To provide a helpful response, I need more context. "Which 762 x 53" could refer to several things, including:
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Dimensions: Are you asking about something with dimensions of 762 units by 53 units? (e.g., a piece of land, a piece of paper, a building). If so, please specify the unit of measurement (millimeters, centimeters, meters, inches, feet, etc.).
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A product code or model number: Is this part of a product identifier? Knowing the context (e.g., what kind of product) would help.
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A mathematical calculation: Are you asking for the product of 762 and 53? The answer is 40,406.
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Something else entirely: The phrase might have meaning within a specific field or context I'm unaware of.
Please clarify your question with more information so I can provide a relevant and useful answer.