Intervertebral foramen: An opening between vertebrae through which nerves leave the spine and extend to other parts of the body. Also called a neural foramen.
There are basically three different types of apartment size refrigerators based on capacity: The smallest one is the compact cube refrigerator (1.5 to 2.7 cu ft). The next is the compact refrigerator with a capacity of 3.5 to 6 cu ft.
Making the world better, one answer at a time. They are referring to the volume, in this case of an approximate rectangle. So say your refrigerator was 6 feet tall (inside not outside), and 3.5 ft across and 3.5 ft deep. 6ft * 3.5ft * 3.5ft = 21 ft3 which is 21 cubic feet.