Vanadurgā Upaniṣad 3.7.p26

3.7.p26

śaśimadhyagataṃ devyāścakraṃ paramaśobhanam |
tanmadhye ca gato bindurbindumadhyagataṃ manaḥ ||

within the moon is the goddess's supreme, splendid wheel-diagram; / and within it is the drop-point; within the drop-point is the mind;