heptagram

plural heptagrams

1. Either of two regular seven-pointed stars, drawn with the construction lines retained; a heptangle.

   It was with the adoption and widespread use of the seven-day week throughout the Hellenistic world of mixed cultures that this heptagram [the weekday heptagram] was created.

   1995, Carl G. Liungman, Thought Signs: The Semiotics of Symbols: Western Idiograms, IOS Press, →ISBN, page 347

   2 more examples

   page 15: The exercise may be varied by tracing the Heptagram, i. e., passing from one point to another of a regular Heptagon in this order — 1, 4, 7, 3, 6, 2, 5, 1. page 81: If the hand is stiff, it may be loosened and trained into tune with Nature's formative processes by the practice of drawing the Pentagram and Heptagram.

   1890, Mary Everest Boole, Logic Taught by Love, Alfred Mudge & Son

   Note that there are two different heptagrams, one goes around twice and the other thrice; moreover, the configuration at the core of the 3-heptagram is in fact a 2-heptagram and the figure at the core of that is an ordinary heptagon.

   2009, John Barnes, Gems of Geometry, Springer, →ISBN, page 27

2. rareA heptagon.