Number of icons that you can use with Bootstrap elements is really impressive (140!). I don’t know, if Chris has given anywhere a complete list of them, so I prepared my own and want to share it:
adjust, align-center, align-justify, align-left, align-right, arrow-down, arrow-left, arrow-right, arrow-up, asterisk, backward, ban-circle, barcode, bell, bold, book, bookmark, briefcase, bullhorn, calendar, camera, certificate, check, chevron-down, chevron-left, chevron-right, chevron-up, circle-arrow-down, circle-arrow-left, circle-arrow-right, circle-arrow-up, cog, comment, download, download-alt, edit, eject, envelope, exclamation-sign, eye-close, eye-open, facetime-video, fast-backward, fast-forward, file, film, filter, fire, flag, folder-close, folder-open, font, forward, fullscreen, gift, glass, globe, hand-down, hand-left, hand-right, hand-up, hdd, headphones, heart, home, inbox, indent-left, indent-right, info-sign, italic, leaf, list, list-alt, lock, magnet, map-marker, minus, minus-sign, move, music, off, ok, ok-circle, ok-sign, pause, pencil, picture, plane, play, play-circle, plus, plus-sign, print, qrcode, question-sign, random, refresh, remove, remove-circle, remove-sign, repeat, resize-full, resize-horizontal, resize-small, resize-vertical, retweet, road, screenshot, search, share, share-alt, shopping-cart, signal, star, star-empty, step-backward, step-forward, stop, tag, tags, tasks, text-height, text-width, th, th-large, th-list, thumbs-down, thumbs-up, time, tint, trash, upload, user, volume-down, volume-off, volume-up, warning-sign, wrench, zoom-in, zoom-out
Hope, this will be usefull to someone.