You're asking about the lunar phases where we see less than half the illuminated portion of the moon. Here's the breakdown:

* Crescent Moon: This is the phase where we see a sliver of the moon, less than half illuminated.

* Waning Crescent Moon: This is a crescent moon that's shrinking in size as it moves toward the new moon.

Important Note:

* New Moon: During the new moon phase, we cannot see the moon at all because it's positioned between the Earth and the sun, with its unlit side facing us.

* Waxing Crescent Moon: This is a crescent moon that's growing in size as it moves towards the first quarter.

Let me know if you'd like more detail on any of these phases!