What does the ff mean in the index?

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What does the "ff" mean in the index?

I am browsing the index in Dummit & Foote and I notice that a lot of the page numbers have ff. after them. What does this mean?

For instance,

"Gaussian integers, 229ff., 271, 278, 289ff., 377"
 
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A reference such as 229ff. usually means: Page 229 and following pages. (The topic is mentioned over several pages, not just one.)