What is "high court of justiciary"

The High Court of Justiciary is the supreme criminal court of Scotland.

The High Court is both a court of first instance and a court of appeal. As a court of first instance, the High Court sits mainly in Parliament House, or in the former Sheriff Court building, in Edinburgh, or in its own court buildings in Glasgow and Aberdeen. However it sometimes sits in various smaller towns in Scotland, when it borrows the local Sheriff Court building. As a court of appeal, it sits only in Edinburgh.

The High Court of Justiciary has also sat once outside Scotland, at Zeist in the Netherlands during the Pan Am Flight 103 bombing trial, as the Scottish Court in the Netherlands.