Don't worry - it all means the same thing. And that thing is this: Swingweight is a measurement that describes how the weight of a club feels when the golfer is swinging that club.
Swingweight is expressed as a letter and number, e.g., C10 or D2. Measurements range from A0, the lightest, to G10, the heaviest. A club that is measured at D5, for example, will feel heavier when swung than a club that is measured at C7 - although both clubs' actual weight may be identical.
Swingweight is mostly used to match clubs in a set. It is ideal (although not always critical) for clubs within a set to match in swingweight.
A more in-depth explanation of swingweight can be found in our FAQ, "What is swingweight, and do I need to care about it?"
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"I like a lighter feel in my swing, so I'm looking for clubs with a lower swingweight."