It is difficult to tell without the context but it could be a "broken" axis in a chart. That is an axis which starts from a value other than zero.
For example, if you wanted a chart where the horizontal axis covered recent years, you would normally not want the axis to go back to 0. So you would have a z-flash on the x-axis and start at a convenient year, say 1990.
normally a thin line with another thin line.
The symbol for a creek on a map is typically a blue line with lines intersecting it at right angles indicating the direction of flow. It is often labeled with the word "Creek" or a thin blue line with arrows showing the flow direction.
The Thin Green Line was created in 2007.
Walking on a Thin Line was created in 301.
The Thin Pink Line was created in 1998.
A double bar - a thin line followed by a thick line - signifies the end of a piece of music. On occasion the word "Fine" (fee-nay) accompanies this symbol.
The duration of The Thin Pink Line is 1.77 hours.
A black square with a red line is often used as a symbol for "No" or "Prohibited." It is commonly seen in warning signs to indicate that a particular action or behavior is not allowed.
The Thin Line Between was created on 2008-07-15.
The Thin White Line - novel - was created in 1977.
The Thin White Line was created on 2001-07-11.
The Thin Red Line was released on 12/23/1998.