The best replacement for glyphicons is font awesome.

The best alternatives to glyphicons are rated as following:
★★★★★  font awesome
★★★  glyphish

Your alternative for glyphicons is not listed? Suggest!
Speaking about glyphicons, one probably shouldn't forget about bootstrap.

Other search terms related to glyphicons and their ratings are:
★★★★★ bootstrap
You have in mind a companion for glyphicons and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of glyphicons in all years. Click on graph for more.
glyphicons
font awesome
glyphish