One would think that a language-independent icon would be an unambiguous link on a web page. But that depends on whether everyone sees the same thing and whether everyone observes the same conventions.
Home page icons are quite variable in appearance. They might not even look like a typical "home" in many locales.
Look at the home poge of the maintenance agency for the International Standards Organization's list of country codes(ISO 3166), Germany's DIN Deutsches Institut für Normung e.V. They use the following icons:
Can you tell which is the Email icon and which is the Home page?
Many might confuse the envelope look in the Home page. The international symbol i for information is fine, but here it is called a Help link, which is usually a ? question mark. And the at symbol @ is sometimes used for an "about" link.