The US dry pint is a unit of volume in the US customary system with the symbol dry pt.
1 US dry pint is equal to 1/8 of a dry gallon. This is equal to 1/2 US dry quart or 33.6003125 in³.
The dry pint was derived from the the British corn gallon which was 1/8 the standard 'Winchester' bushel or corn. This was the equivalent of 268.8 in³ when in dry form.
The acre-foot is a unit of volume in the US customary unit system with the symbol ac⋅ft.
It represents the volume contained in a box measuring 660 feet long, 66 feet wide and 1 foot deep. This can be thought of a box the size of an acre but 1 foot deep.
It is approximately the same volume as an 8 lane swimming pool; 25 metres in length, 3 metres deep and 16 metres wide (assuming lanes are 2 metres wide).
It is still used in the US despite its links to the much-outdated imperial system of units. For example a "rule of thumb" is that an average suburban family's annual water usage should be around 1 acre-foot. This is equal to just under 3.4 m³ daily.