Big
BIG element is one of the FONT style elements in HTML. Big renders its content in the next higher font size on a 1 to 7 scale. If you nest BIG elements, the effects on the next nested elements are cumulative, with each nested level renders one size larger than the previous nested level font size. For more precise control of font size rendering in your website content use CSS rules. For Example:
<P>For high ranking of your website in search engine result pages(SERPs), search engine optimization also called as <BIG>SEO</BIG> and search engine marketing as <BIG>SEM</BIG> help in achieving great results</P>