A question I had regarding this issue also. Thank you Moz Community for the answer!
- Hey there guys, have heard some recent information from some experts that utilizing commas in headings, meta titles or descriptions is not good for ranking. Can you guys please shed some light on this?
No absolutely not . We can use comma or pipes, dashes as a separator in meta title, description or heading but not underscore. You can also watch below video to know more.