Final answer:
The interspace between ribs is numbered using Arabic numerals.
Step-by-step explanation:
Ribs are numbered 1-12. The numbering of the ribs is based on the position in the rib cage. The first pair of ribs is attached to the sternum and is called the first rib. From there, the ribs are numbered sequentially up to the twelfth rib.
So, the interspace between ribs is numbered using Arabic numerals.