What does a dash mean in an Internet search?

A dash is considered a word separator. Similar topics can be found here in regards to dashes vs apostrophes, though this mostly references is in regards to a URL. The problem you’re up against is one that I’ve personally dealt with on my site o-ring vs o ring vs oring vs o’ring.

For More Information Please Refer: https://moz.com/community/q/how-is-a-dash-or-handled-by-google-search