A curved arrow symbol pointing counterclockwise, commonly used to denote cyclic permutations or leftward rotational transformations.
Examples
Left rotation operation
R_\theta(x) \curvearrowleft x
Cyclic group action
G \curvearrowleft X \text{ denotes a left group action of G on X}
Circular permutation notation
(1 \curvearrowleft 2 \curvearrowleft 3) \text{ represents the cycle } (1,2,3)