We'd like to use analytics cookies to understand which symbols people look up, so we know what to research next. They are not used for advertising and we set none of them unless you say yes. What we store.
A long-dash-dot line marking an axis of symmetry or a circle's centre.
Also known as: Center line, Axis line, Dash dot line
A line of alternating long dashes and dots is a centre line: it marks an axis rather than an edge. Line style is a vocabulary in technical drawing, and reading a centre line as a physical edge is the commonest beginner's error.
Marks an axis of symmetry, the centre of a circle or the path of a moving part — never a physical edge of the object.
Contexts: Technical drawing
Belongs to a vocabulary of line styles in which the pattern carries the meaning: continuous for visible edges, dashed for hidden ones, dash-dot for axes.
Contexts: Technical drawing
Crosses at the centre of a circle so the intersection marks the exact point, which is why holes are dimensioned from it.
Contexts: Technical drawing
A thin line made of long dashes separated by single short dashes or dots, repeating evenly along its length.
Both are broken thin lines; the dash-dot rhythm against even dashes is the whole distinction.
Members of the line-type vocabulary where the pattern is the meaning.