Kashida

Kashida (Persian:کشیده‎‎; "extended", "stretched", "lengthened") is a type of justification used in some cursive scripts related to Arabic. In contrast to white-space justification, which increases the length of a line of text by expanding spaces between words or individual letters, kashida justification is accomplished by elongating characters at certain chosen points. Kashida justification can be combined with white-space justification to various extents.