Feet are usually written as ', and the symbol is also used to denote arcminutes.
Prime units of any type will also be marked in such a manner, as are minutes of angle and time.
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Derived unit
It can either be described as 30 pounds per box, or 1/30 box per pound.
Either. A tin could described as 0.4 litres or 400 millilitres. In the UK they are often labelled in terms of the met mass (or weight).
By definition: a metric unit volume (the liter) is defined as 10 cm3 or 1 dm3 (decimeter). 1/1000 of that space is a mL, and that volume is also described as 1 cm3.
The abbreviation lb comes from the Latin word libra, meaning scales or balances which also described a Roman unit similar to the pound.