They meant 36 inches.
And what about mm and cm? They are only a factor of 10 apart while inches and feet are 12X apart.
https://www.forestrallshop.co.uk/plywood-london/birch-plywoo...
Comically they apparently also imported our lumber price fiasco.
It's amusing to see newspaper stories where they report high precision numbers that are obviously metric conversions like "He drove 62.14 miles to work every day" when the original source said "100km".