Zero-width non-joiner
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The zero-width non-joiner (ZWNJ) is a non-printing character used in the computerized typesetting of some cursive script , Korean hangul or Persian script. When placed between two characters that would otherwise be connected, a ZWNJ causes them to be printed in their final and initial forms, respectively. This is also an effect of a space character, but a ZWNJ is used when it is desirable to keep the words closer together. The ZWNJ is represented in Unicode is U+200C, and can be represented in HTML as ‌ or ‌.
[edit] Persian example
Correct form with ZWNJ: میخواهم
Incorrect: می خواهم or میخواهم
