You can buy the full set http://glyphicons.com/. Or get them free with attribution. A keys glyph is included.

Then incorporate them. http://stackoverflow.com/questions/9486443/bootstrap-glyphicons

>I understand. But since Bootstrap fonts do not have the equivalent of "icon-key" and a few others, I am left without any. Before, in Bootstrap 2, there was an option.
>
>>Also, fonts are smaller and take less time to transfer to the browser.
>>
>>>>Note : Fonts are better because you can set the font color if you wish - far more flexible than an image.....
>>>
>>>Thank you.