Attention-getter, in some rooms

• Warning that a man is about to cry
• Hearing command
• Repeated courtroom cry
• Bringer of order in the court
• Crier's call
• Court call, when said thricely
• Bailiff's cry
• Command from a bailiff

Wiktionary Word definitions in Wiktionary
interj. hear ye. Attend. (Called by public criers or in court usually three times to secure silence). n. A cry of "oyez".

Wikipedia Word definitions in Wikipedia
Oyez (, , , more rarely with the word stress at the beginning) is a traditional interjection said two or three times in succession to introduce the opening of a court of law , especially in Great Britain. The interjection is also traditionally used by town ...