Template:Br

Explanation

The template itself is, invisibly, above. It consists of:

<br style="clear:both" />

This is a line break, with the extra twist that it clears (comes below) anything — that it doesn't allow floating — at either side.

Use

As there seems little chance that this template will be changed, it is an excellent candidate for "Subst" (substitution rather than transclusion). Use it like this:

{{Subst:Br}}

Saving it will then convert it, to:

<br style="clear:both" />