Quaternion.AngleAxis

Description

Creates a rotation which rotates angle degrees around axis.

The rotation is counter-clockwise when looking from the origin along the axis of rotation. For more information, refer to Rotation and Orientation in Unity. The magnitude of the axis parameter is not applied.

using UnityEngine;

public class Example : MonoBehaviour
{
    void Start()
    {
        // Sets the transform's current rotation to a new rotation that rotates 30 degrees around the y-axis(Vector3.up)
        transform.rotation = Quaternion.AngleAxis(30, Vector3.up);
    }
}