It's the waxing crescent or new crescent.
New Moon.
The New Moon always occurs very close to the moon's "new moon" phase.
On a New Moon PhaseOn a New Moon Phase
The Moon's phase is New Moon.
New Moon Phase
New Moon Phase
In the new Moon phase.
The moon will disappear when it is in the new moon phase, as ironic as that sounds.
A waxing Moon can be seen when the Moon is larger in the sky, and is moving from the new Moon phase, and into the full Moon phase. A waning Moon is seen when the Moon is visibly smaller in the sky, and is moving from the full Moon phase, and into the new Moon phase.
About 29.5 days.
new moon
One is facing the other way.