I know, that i can insert it in 'pre' tag, but is there any other solution?
PS.
When I add it is printed as space.
It is equivalent to the tab character as such. Thus, from the HTML viewpoint, there is no need to “escape” it using the character reference; but you may do so e.g. if your editing program does not let you enter the character conveniently.
The tab character can be inserted by holding the Alt and pressing 0 and 9 together.
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.
Just use  
As the same affect of tab
sign
Use & emsp; (without space, as html entity) to put a emphasized space... Similar to tab character &t
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