size	Font size	<img src="http://docs.simplemachines.org/Themes/default/images/bbc/size.gif" alt="" class="bbc_img" />
[size=x-large]text or more BB Code[/size]	The size tag formats text with a specific font size. The recommended size formats are points, pixels, and relative-size keywords, as defined in the CSS2 specs. This is an inline tag and no block level tags can be placed inside, however other inline tags can be if nested correctly.	text or more BB Code