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also make sure not to use any special symbols like the arrows, sqaures or other eye catching stuff, they are very easy for search engines to notice
Is there a limit to the number or suggested number of commas to use?
As I'm interpreting this question, it's not about commas, but about whether lists are allowed.
There's not exactly a rule against lists, I think, but there are some problems with excessive repetition of any one word in the title tag, about what this repetition might gain you vrs what it loses for you, and there are other questions like how the engines and searchers look at lists versus natural language.
The thread below asks essentially the same question in a different way, and some of the discussion applies to this thread too. The difference between hyphens and commas isn't that important... they're both delimitors.
Is it useful to use keywords in page title?
[webmasterworld.com...]