When using HTML entities, you can use either the entity number or the entity name.
they will always remain on the same line as each other). The letters nbsp are probably understood in all languages because of the html sequence used to enter them in wikitext. If you are using HTML and you would like more than one space to to appear, will not work. If the text must wrap to a new line, both words on either side of the non-breaking space will wrap together (i.e. Good question and I'm not aware of us having an answer to it.
Is nbsp understood across wikis? If not then do we need a visual representation via an icon?