The best replacement for spaces is tabs.

The best alternatives to spaces are rated as following:
★★★★★  tabs
★★★★  expose
★★★★  mission control
★★★  tabs python
★★★  altiverb
★★★  circuits
★★  tabs javascript
★★  tabs html
★★  raid
★★  ashley furniture
★★  portal
★  tabs c++
★  space
★  tabs php
★  underscores
★  tabs indentation
★  basements
★  american chopper
  flexraid
  one space
  blogger
  orange county choppers
  unraid

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

Other search terms related to spaces and their ratings are:
★★★★★ ellipses
★★★★ em dashes
★★★ dashes
★★ tabs
★★ underscores
★★ paige
★ slashes
★ paige davis
★ robocopy
page davis
places
You have in mind a companion for spaces and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of spaces in all years. Click on graph for more.
spaces
tabs
expose