# What does the latin letter mean in Bayer name of a star such as “$\Upsilon$ Andromedae $b$”?

What does the latin letter mean in Bayer name of a star such as the "$b$" in "$\Upsilon$ Andromedae $b$"? I tried in vain to look it up in Wikipedia or elsewhere on the Web.

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So $\Upsilon$ Andromedae is a multiple star system? –  qazwsx Jul 21 '12 at 19:28