What does r mean in Rubik's Cube?

In the context of Rubik's Cube notation, "r" represents a clockwise 90-degree turn of the right face.

Here's how it works:

• r: Turn the right face clockwise.
• r': Turn the right face counterclockwise.
• r2: Turn the right face 180 degrees.

This notation is commonly used to describe and execute algorithms for solving the Rubik's Cube.

Example:

The algorithm "r U r' U'" involves the following steps:

1. r: Turn the right face clockwise.
2. U: Turn the top face clockwise.
3. r': Turn the right face counterclockwise.
4. U': Turn the top face counterclockwise.

This algorithm will manipulate the cube in a specific way, often used as part of a larger solution strategy.