Spirolateral
A figure formed by taking a series of steps of length 1, 2, ..., 
, with an angle 
turn after each step. Thesymbol for a spirolateral is 
, where the 
s indicate that turns are in the 
direction for these steps.
References
Gardner, M. ``Worm Paths.'' Ch. 17 in Knotted Doughnuts and Other Mathematical Entertainments. New York: W. H. Freeman, 1986. Odds, F. C. ``Spirolaterals.'' Math. Teacher 66, 121-124, 1973.
- Stratified Manifold
- Strehl Identity
- Striction Curve
- String Rewriting
- Strip
- Strong Convergence
- Strong Elliptic Pseudoprime
- Strong Frobenius Pseudoprime
- Strong Law of Large Numbers
- Strong Law of Small Numbers
- Strong Lucas Pseudoprime
- Strongly Connected Component
- Strongly Embedded Theorem
- Strongly Independent
- Strongly Triple-Free Set
- Strong Pseudoprime
- Strong Pseudoprime Test
- Strong Subadditivity Inequality
- Strong Triangle Inequality
- Strophoid
- Structurally Stable
- Structure
- Structure Constant
- Structure Factor
- Struve Differential Equation