Saint Andrew's Cross
A Greek Cross rotated by 45°, also called the crux decussata. The Multiplication Sign 
is based onSaint Andrew's cross (Bergamini 1969).
References
Bergamini, D. Mathematics. New York: Time-Life Books, p. 11, 1969.
- Kummer's Formulas
- Kummer's Function
- Kummer's Quadratic Transformation
- Kummer's Relation
- Kummer's Series
- Kummer's Series Transformation
- Kummer's Test
- Kummer's Theorem
- Kummer Surface
- Kuratowski Reduction Theorem
- Kuratowski's Closure-Component Problem
- Kuratowski's Theorem
- Kurtosis
- Kähler Manifold
- König-Egeváry Theorem
- Königsberg Bridge Problem
- König's Theorem
- Kürschák's Tile
- L1-Norm
- L2-Norm
- L2-Space
- Labeled Graph
- Lacunarity
- Ladder
- Ladder Graph