On the pages where you see the icon below, you can bookmark, store, tag and share links online.

Social Bookmarking Icon
You can share these pages with friends or just other people with similar interests.
To view the bookmark options, hover over the image and you will get a drop-down list (see below). Simply select the website you would like to add your bookmark to.

Social bookmarking icon, with drop-down.
The sites themselves are free, but you do need to register with them if you don't have an account.
This means that you can save pages of the Brunel's ss Great Britain website for future reference.
Wikipedia offers more information about social bookmarking:
Wikipedia explains social bookmarking
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