Entities are used to display reserved HTML character.
Most of HTML tag start use <, > sign. if you use <, > sign in your page as text you need to use < for < sign and > for > sign.
You can also use entity number such as @#60; for <
Attributes are provided with start tag of HTML element.
|Description||Entity Name||Entity Number|
|non-breaking space|| || |
A diacritical mark (Special character) is a "glyph" added to a letter. Some diacritical marks, like acute ( ̀) and grave ( ́) are called accents.
Diacritical marks can appear both above and below a letter, inside a letter, and between two letters.
Diacritical marks can be used in combination with alphanumeric characters, to produce a character that is not present in the character set (encoding) used in the page.
Following can be used to display Diacritical mark in HTML