A heading indicator is a magnetic compass powered by vacuum pressure. Also know as a gyro. It is used in avaiation. To read it, simply look at the direction that the arrow is pointed too. For example, the arrow could point at 33. This means the aircraft is at a heading of 330 degrees. If it points at 3, it means it's at a heading of 30. But if it's into the tenths, you do not add a zero.
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It is a further heading to describe more about what the article is on.
<h4>Heading 4</h4>
It supports 6 heading sizes using the <h1> to <h6> tags. The <h1> is the largest heading.
When you create an HTML document, you can include a heading on the page. Here is an example of how you can use HTML to center the heading: <center><h1>Page Heading</h1></center>.
<h3> is the tag for starting the heading level 3. It is for mid-size of a heading, out of the 6.