This is the three four time signature. It indicates that there are three beats in each bar. Three four time is also known as waltz time. There are three quarter notes in one bar of ^ time.
The following chord progression is written in ^ time. To help keep time, accent (play louder) the first strum in each bar. Use your first and second fingers as pivots when changing between C and Am. Use your first finger as a pivot when changing between Dm and G7.
Rhythm Pattern