My math classroom is bustling with activity from day to day. My students work cooperatively in teams of four students. And this combination requires an attention signal that will bring my students back to me for announcements, helpful hints, etc.
I raise my hand and say, "Freeze, please. Stop. Look. And listen." This attention signal gives my students 5 seconds to freeze their conversations and listen closely for directions.
Some cues are visual; other attention getters are verbal. What do you use in your classroom?