deltahedron
All faces triangular
A deltahedron is a polyhedron whose faces are all equilateral triangles.
The term comes from the Greek letter delta (Δ), which has a triangular shape.
Common examples include the tetrahedron (4 faces), octahedron (8 faces), and icosahedron (20 faces).
The word appears primarily in geometry and crystallography.
Curved outward externally
- triangularThree-cornered in form
- PlatonicOf the Forms philosopher
- solidFirm matter state
- three-dimensionalHaving volume and depth
geometric · regular · symmetry · rigid · framework · skeleton · configuration · form
Three-sided plane figure
- equilateralHaving all sides congruent
- surfaceOutermost boundary layer
- planeWinged flying vehicle
- polygonMultisided plane figure
area · congruent · orientation · adjacent · coplanar · tessellation · triangulation · mesh
Flat-space geometry type
- mathematicsScience of quantity and structure
- trigonometryTriangle angle mathematics
- topologyStudy of spatial arrangement
- combinatoricsMathematics of discrete enumeration
proof · theorem · formula · Euler · classification · enumeration · convexity · regularity
Meeting point of edges
- apexUppermost point or culmination
- pointExact location or meaning
- nodeConnection point in networks
- degreeUnit of measurement
valence · coordination · intersection · convergence · trivalent · tetravalent · configuration · connected
convex
Curved outward externally
- triangularThree-cornered in form
- PlatonicOf the Forms philosopher
- solidFirm matter state
three-dimensional · geometric · regular · symmetry · rigid · framework · skeleton · configuration · form · shape
triangle
Three-sided plane figure
- equilateralHaving all sides congruent
- surfaceOutermost boundary layer
- planeWinged flying vehicle
polygon · area · congruent · orientation · adjacent · coplanar · tessellation · triangulation · mesh · faceted
Euclidean
Flat-space geometry type
- mathematicsScience of quantity and structure
- trigonometryTriangle angle mathematics
- topologyStudy of spatial arrangement
combinatorics · proof · theorem · formula · Euler · classification · enumeration · convexity · regularity · mathematical
corner
Meeting point of edges
degree · valence · coordination · intersection · convergence · trivalent · tetravalent · configuration · connected
segment
Distinct part of whole
- connectivityState of being linked
- adjacencyState of being beside
- lengthMeasure of extent
shared · coincident · graph · network · skeletal · linkage · bond · strut
deltahedroncube
Six-squared-faced solid
hexahedron · dodecahedron · prism · parallelepiped · pentahedron
delta, polyhedron, octahedron, tetrahedron, icosahedron, tetrahedral, polyhedral, octahedral, polyhedrons