Why is Harappan script considered an enigmatic script or mysterious

1.	Why is Harappan script considered an enigmatic script or mysterious script?
Answer» Because it is yet to be deciphered. Its mystery has still not been solved yet. It was not alphabetical. It had too many signs; all the signs symbolized certain things. The sign of this script were of the period 375 to 400. The script has been found on a variety of objects.

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