Tab space instead of multiple non-breaking spaces ("nbsp")?
Is it possible to insert a tab character in HTML instead of having to type four times?
It depends on which character set you want to use.
There's no tab entity defined in ISO-8859-1 HTML - but there are a couple of whitespace characters other than such as  ,  ,and  .
In ASCII, 	 is a tab.
Here is a complete listing of HTML entities and a useful discussion of whitespace on Wikipedia.
It's much cleaner to use CSS. Try padding-left:5em or margin-left:5em as appropriate instead.