In most of the cases, a single Unicode character represents a single grapheme. For instance U+0066 LATIN SMALL LETTER F is an English writing f.

There are cases when a grapheme contains a sequence of characters. å is an atomic grapheme in the Danish writing system.

• It is displayed using U+0061 LATIN SMALL LETTER A (rendered as a)
• Combined with a special character U+030A COMBINING RING ABOVE (rendered as ◌̊).

U+030A modifies the precedent character and is named combining mark:

> '\u0061'
'a'
> '\u0061\u030A'
'å'

See the article Combining marks