This is called a repeat sign. It is the 'end repeat'.
When you see this, you would go back to the beginning, or to the nearest 'start repeat' sign.
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A double bar-line indicates the end of a section. When the second line is thicker than the first, it indicates the end of the piece.
a double bar line is what music is played on ( i am 12 years old)" No...not at all... A double bar-line indicates the end of a section. When the second line is thicker than the first, it indicates the end of the piece.
After a note it makes the duration 50% longer (i.e. x 1.5). Thus a dotted half = 3 quarters (instead of two for an un-dotted quarter), a dotted quarter = 3 eighths, etc. A double-dotted note (two dots after it) is 75% longer, so a double-dotted half = 7 eighths (half + a quarter + an eighth). Two dots (vertically) before a double-bar line means repeat back, to either the closest mirror-image dotted double-bar, or (if that's not there) the start.
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normally a thin line with another thin line.
That would be the bass clef. There is a curved shape with two dots next to it: the dots are on either side of whichever line is designated as F.