Pegg
- 24-Cell
- Allais Paradox
- Almost Integer
- Amphichiral Knot
- Archimedean Dual Graph
- Barnette's Conjecture
- Biggs-Smith Graph
- Blanuša Snarks
- Borromean Rings
- Bouniakowsky Conjecture
- Braced Polygon
- Bravais Lattice
- Bresenham's Line Algorithm
- Cage Graph
- Calkin-Wilf Tree
- Catalan's Conjecture
- Catalan-Mersenne Number
- Cayley Graph
- Class 1 Graph
- Class 2 Graph
- Clebsch Graph
- Condorcet Candidate
- Conic Section
- Cork Plug
- Coxeter Graph
- Cuban Prime
- Cube Dovetailing Problem
- Cube Root
- Cubic Graph
- Cubic Nonplanar Graph
- Cubic Number
- Cubic Symmetric Graph
- Dark Satanic Mills on a Cloudy Day
- Delannoy Number
- Delian Brick
- Demiregular Tessellation
- Desargues Graph
- Directed Strongly Regular Graph
- Distance-Regular Graph
- Dodecahedral Graph
- Dom
- Dots and Boxes
- Double Mersenne Number
- Double Star Snark
- Doyle Graph
- Dyck Graph
- e Approximations
- Echelon Form
- Edge Splitting
- Ellipse
- Empire Problem
- Euler-Mascheroni Constant Approximations
- Ferrier's Prime
- Fibonacci Number
- Flower Snark
- Foster Cage
- Foster Graph
- Fricke-Macbeath Graph
- Frucht Graph
- Generalized Petersen Graph
- Gewirtz Graph
- Golay Code
- Goldbach Partition
- Graph Crossing Number
- Graph Excision
- Graph Minor
- Graph Thickness
- Grünbaum-Rigby Configuration
- Guilloché Pattern
- Hackenbush
- Hamilton-Connected Graph
- Hamilton-Laceable Graph
- Heilbronn Triangle Problem
- Hemiobelisk
- Heronian Tetrahedron
- Hexagon Tiling
- Hexahedron
- Hoffman-Singleton Graph
- Holyhedron
- HSBC Graph
- Hypergeometric Distribution
- Icosahedral Group
- Independence Axiom
- Indeterminate
- Integer Triangle
- Integral Graph
- Isohedron
- Isomorphic Factorization
- Kepler's Monsters
- Kepler Triangle
- Kirkman's Schoolgirl Problem
- Kneser Graph
- Langton's Ant
- LCF Notation
- Lebombo Bone
- Level-k Thinking
- Line Graph
- Line-Line Intersection
- Lion and Man Problem
- Logic
- Magic Tour
- Margin of Error
- McLaughlin Graph
- Meringer Graph
- Möbius Function
- Möbius-Kantor Graph
- Mondrian Art Problem
- Moore Graph
- Mrs. Perkins's Quilt
- Multichoose
- New Kind of Science
- Nonaveraging Sequence
- Octahedral Group
- Odd Graph
- Ordinary Line Graph
- Pancake Sorting
- Pandigital Fraction
- Pappus Graph
- Parabola
- Paris Constant
- Partition Function P
- Peacock Tail
- Pell Number
- Pell Prime
- Penrose Triangle
- Pentagon Tiling
- Petersen Graph
- Pi Approximations
- Pisot Number
- Planar Difference Set
- Plastic Constant
- Polyhedral 6-Vertex Graph
- Polyhedral 7-Vertex Graph
- Precedence
- Prime Factorization
- Prime Gaps
- Prime Spiral
- Ramanujan Constant
- Real Projective Plane
- Relatively Prime
- Ring
- Road Coloring Problem
- Robertson Graph
- Robertson-Wegner Graph
- Semiprime
- Shaw Prize
- Sierpiński Number of the Second Kind
- Single-Track Gray Code
- Small Rhombicosidodecahedral Graph
- Small World Phenomenon
- Smallest Quartic Crossing Number Graph
- Smoothed Octagon
- Snark
- Snub Dodecahedral Graph
- Social Golfer Problem
- SOHCAHTOA
- Space-Filling Hexahedron
- Space-Filling Tetrahedron
- Sparse Ruler
- Sphere Packing
- Square Dissection
- Square Tiling
- Squarefree
- State Diagram
- Steiner Triple System
- Strange Attractor
- Strongly Regular Graph
- Substitution Tiling
- Sudoku
- Supergolden Ratio
- Superplastic Ratio
- Sylvester Graph
- Symmetric Graph
- Szekeres Snark
- Tetragonal Trapezohedron
- Tetrahedral Group
- Three-Colorable Map
- Thue-Morse Sequence
- Topological Space
- Triakis Icosahedral Graph
- Triangle Center
- Triangle Dissection
- Triangle Dissection--Equilateral Triangle
- Triangle Dissection--Exceptional Shapes
- Triangle Dissection--Integer Triangles
- Triangle Dissection--Similar Triangles
- Triangle Dissection--Six-Piece Geometry
- Triangular Orthobicupola
- Triangular Prism
- Trinomial Coefficient
- Truncated Tetrahedron
- Turmite
- Tutte 12-Cage
- Tutte's Wheel Theorem
- Unistable Polyhedron
- Voronin Universality Theorem
- Wang's Conjecture
- Waterman Polyhedron
- Wells Graph
- Wichmann Ruler
- WireWorld
- Witt Design
- Wong Graph