Definitions for "Headings"
In (X)HTML there are 6 levels of headings, h1 through to h6. To maintain the logical structure of your documents, headings should follow a logical progression. Headings of level 3 shouldn't follow directly from headings of level 1, only from headings of level 2. You should always try to maintain a distinction between appearance and logic. Simply because an element is a heading of level 2 does not mean that it will be rendered larger and bolder than regular text in the document. Style sheets allow a web designer to very easily apply any styling to a heading. Keep in mind too, that there are browsers which don't display information in a visual way, relying on text to speech conversion, or braille conversion. For maximum accessibility, structural elements such as headings should be used correctly, and appropriately. Also see structure.
Headings are used to denote headings, and sub-headings throughout a document.
These are used to mark divisions of a document and there are six levels of headings in total. Heading 1 is the highest level of heading that can be included in a document and has the following format H1.
Titles or labels for columns in a spreadsheet.
Keywords:  larger, copy, begins, indicates, item
Larger than body copy, usually indicates where a new item begins