you can't have too much special characters in the url, at max you can get the underscores or hifens etc. i suggest you to forget it, and get a domain only with the letters! that will be the best from seo point of view. underscores are a major problems when it comes to the indexing! only letters is the best solution
I would advise not using spaces and special characters in url.If you are talking about dynamic url, then you can use url rewriting.
actually that special character i'm referring to is ñ as its part of the name/ description of the page... would that be ok?
don't put the ñ on the URL, replace it by an n. It'll be replaced by some weird characters when you publish the URL
Don't use special characters as they could discard your keyword inside the SERPS. You may rather use something like %40 if you really need them, but I don't think its advisable. Cheers ! Thibaut
i dont think urls are allowed in special character, u can have urls only in english character, i dont think wat u're asking for is possible at first place. There are some talks going on having localized url, till then english is the only option.
Do you know the difference between "-" and "_" in URL? "_" should be used when you want to promote a 2 keyword phrase, like "office chair" - url will look like www.anythinghere.com/office_chair.com - in this case SEs will consider "office chair" as 2 separate words, and the page will get a better visibility for the keyword.