This time signature is called the three four time signature.
It tells you there are three beats in each bar.
Three four time is also known as waltz time.
A dot placed after a note extends its value by half.
A dot placed after a half note means that you hold the note for three beats.
One dotted half note makes one bar of music in ^ time.
A dot placed after a two beat strum means that the strum lasts for three beats, which is one bar of music in ^ time.