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flow is a ZZT-OOP direction token which points in the direction an object is walking, or more technically points in the direction of an object's x-step and y-step.

flow often paired with a direction modifier, such as opp flow, ccw flow, or rndp flow, allowing an object to take actions relative to its current orientation.

For objects with custom x/y-steps, flow can be used to have objects put things remotely. Additionally, using flow with direction modifiers allows objects to change the direction they are walking while preserving their custom x/y-steps.