- A six-pointed star formed by extending each of the sides of a regular hexagon into equilateral triangles.
- A figure of six lines or sides.
- A figure formed of two equilateral triangles placed concentrically with their sides parallel and on opposite sides of the center. This was the seal or symbol of the Pythagorean school.
- In <em>geometry</em>, a figure of six lines.
- In <em>Chinese lit</em>, one of the 64 figures which form the basis of the Yihking or “book of changes,” one of the oldest Chinese books. Each of these figures is made up of six parallel lines, of which some are whole and some divided. See <internalXref urlencoded="book%20of%20changes">book of changes</internalXref>, under <em>change.</em>
- A figure composed of two equal triangles intersecting so that each side of one triangle is parallel to a side of the other, and the six points coincide with those of a hexagon.
- In Chinese literature, one of the sixty-four figures formed of six parallel lines (continuous or broken), forming the basis of the I Ching (Yih King), or “Book of Changes.”
- A hollow six-pointed <xref>star</xref> formed by <xref>overlapping</xref> two <xref>equilateral</xref> <xref>triangles</xref>; the <xref>Star of David</xref>.
- Any of the 64 <xref>sets</xref> of <xref>solid</xref> and <xref>broken</xref> lines used for <xref>divination</xref> in the <xref>I Ching</xref>.
- A large <xref>silver</xref> <xref>coin</xref> minted during the <xref>Byzantine Empire</xref>.
- a regular polygon formed by extending each of the sides of a regular hexagon to form two equilateral triangles