What is meaning of additional /unlisted list in high court case

In a High Court, an unlisted case is a case that is not listed for hearing on a particular day. A motion list is a schedule of cases that are set to be heard on a given day. Cases that are urgent, left over, or fresh for admission are included in the supplementary list. 

To ensure that urgent cases are heard promptly, lawyers can inform the Registrar of the High Court in writing or by email. The Registrar can then list the case before the appropriate bench.