Like oratory, music, dance, calligraphy — like anything that lends its grace to language — typography is an art that can be deliberately misused. It is a craft by which the meanings of a text ... can be clarified, honored and shared, or knowingly disguised.
In a world rife with unsolicited messages, typography must often draw attention to itself before it will be read. Yet in order to be read, it must relinquish the attention it has drawn.
The Elements of Typographic Style, Robert Bringhurst
Unicode and CSS work together to help handle bidirectional text.