Striking out three times in one game.
Three achievements in a single game, or similar, such as three consecutive wins.
Three wickets taken by a bowler in three consecutive balls.
Three incidents or achievements that occur together.
A means of securing a seat in the House of Commons by placing one's hat upon it.
Three goals scored by one player in a game, in ice hockey usually followed by fans throwing their hats onto the rink.
Any magic trick performed with a hat.
One of a group of three, particularly
A group of three notes played or written where two notes would ordinarily be; a form of tuplet.
One of a group of three siblings born at the same time to the same mother.
A constructed gem consisting of a thin slice of natural opal sandwiched between a clear glass or quartz top and a synthetic or stone backing that enhances the colour of the opal.
A quantum state with three allowed projections for the spin.
A triquark.