acronym Tag in Html
Defines an element that is made up of the first letters of the words of a phrase such as 'CSS'. The title attribute is generally used to specify the whole word or phrase that the abbreviation is referring to. By marking up acronyms you can give useful information to browsers, spellcheckers, screen readers, translation systems and search-engines.
An acronym is also an abbreviation, but an abbreviation is not necessarily an acronym.
<acronym title="Cascading Style Sheets">CSS</acronym>