The empty beat in simplified musical notation is represented by the rest "0". How to express the empty half beat depends on the duration of one beat. A quarter note is used as one beat, and the empty half beat is represented by the eighth rest: Add one horizontal line below 0; use an eighth note as a beat, and use a sixteenth rest to represent an empty half beat: add two horizontal lines below 0. Rests are marks used on music scores to mark temporary pauses or stillness in music and the length of pauses. The use of rests can create different emotional expressions in musical phrases. Rests are mainly named according to the length of the pause, and can be divided into double rests, full rests, half rests, quarter rests, eighth rests, sixteenth rests, thirty-second rests, and sixty-fourth rests. A rest can also be added with a dot to adjust the length of the musical pause. It is named as the original rest name with the word "dot" in front of it, such as a dotted two-part rest.