This is the three four time signature. It indicates 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. This example uses different fingerings for the G and C chords, as shown in the diagram. These fingerings are common and sound great on acoustic guitars.
G
C