Character unit

In CJK, especailly in China, character is used as a unit to measure some paragraph attributes, such as indent, line spacing and tab stop. etc. Character unit is most useful in processing Chinese. For example, users are used to use two characters as the indent of first line of the paragraph.

＊＊大家好

大家好，才是真的好

With character unit, users need not worry about the layout confusion due to font size changing.

For line spacing of paragraph, line unit is used.