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It stands for Reflector - specifically referring to Standard Reflector (which is round) as opposed to other varieties such as ER - Elliptical Reflector.

There are many designations when it comes to light bulbs. This question refers to the bulbs shape designated by one or more letters, followed by a series of numbers. The letters represent the type and the numbers represent the diameter. The location or region typically designates the units of the diameter (mm vs. inches).

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