Translation guide
An octagon is an eight-sided polygon. In Japanese, the most common term is 八角形 (hakkakkei), used in geometry and everyday contexts. The word 八角形 can also refer to octagonal shapes in architecture or design. For specialized contexts like martial arts rings, the loanword オクタゴン (okutagon) is used.
Referring to an eight-sided polygon in mathematics, design, or general description.
Standard term for an octagon in geometry and everyday use. Can describe any octagonal shape.
Referring to the octagonal fighting area in sports like MMA.
Loanword from English, specifically used for the UFC octagon or similar fighting rings. Not used for geometric shapes.
This sign is an octagon.
I bought an octagonal table.
Abbreviation of 八角形, often used in compounds or when the context is clear. Slightly more casual or technical.
This building has an octagonal tower.
The fighter entered the octagon.