In some cases, the foot is denoted by a prime, which is often approximated by an apostrophe, and the inch by a double prime; for example, 2 feet 4 inches is sometimes denoted as 2 ′ 4.
The foot is denoted by a prime. This was in some cases. A prime is often approximated by an apostrophe by a double prime. A prime is often approximated by the inch by a double prime.2 feet 4 inches is sometimes denoted as 2 ′ 4. This was for example.