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・ Polyhexanide
・ Polyhistidine-tag
・ Polyhydramnios
・ Polygonum polymorphum
・ Polygonum ramosissimum
・ Polygonum sawatchense
・ Polygonum shastense
・ Polygonum spergulariiforme
・ Polygonum striatulum
・ Polygonum tenue
・ Polygonum utahense
・ Polygonus
・ Polygoon (newsreel)
・ Polygraff
・ PolyGram
Polygram (geometry)
・ PolyGram Filmed Entertainment
・ PolyGram Polska
・ Polygrammate
・ Polygrammate hebraeicum
・ Polygrammoceras
・ Polygrammodes
・ Polygrammodes atricosta
・ Polygrammodes auropurpuralis
・ Polygrammodes baeuscalis
・ Polygrammodes biangulalis
・ Polygrammodes citrinalis
・ Polygrammodes compositalis
・ Polygrammodes croesus
・ Polygrammodes cuneatalis


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Polygram (geometry) : ウィキペディア英語版
Polygram (geometry)

In geometry, a generalized polygon can be called a polygram, and named specifically by its number of sides, so a regular pentagram, , has 5 sides, and the regular hexagram, or 2 has 6 sides divided into two triangles.
A regular polygram can either be in a set of regular polygons (for gcd(p,q)=1, q>1) or in a set of regular polygon compounds (if gcd(p,q)>1).
==Etymology==
The polygram names combine a numeral prefix, such as ''penta-'', with the Greek suffix ''-gram'' (in this case generating the word ''pentagram''). The prefix is normally a Greek cardinal, but synonyms using other prefixes exist. The ''-gram'' suffix derives from ''γραμμῆς'' (''grammos'') meaning a line.〔(γραμμή ), Henry George Liddell, Robert Scott, ''A Greek-English Lexicon'', on Perseus〕

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