Idt weird but somehow still used units from all over the world. Maybe with an interesting backstory. (inb4 metric system vs. imperial system)
BTU - British Thermal Units - I bought an air conditioner in *Germany*, and was surprized that it is common to give their cooling power in BTU. A British Thermal Unit is the amount of energy required to heat 1 pound of water about 1 degree Fahrenheit.
SKE - Steinkohleeinheit - The average amount of energy one can gain from burning one ton of bituminous coal
Stere - 1x1x1 to 1x1x1.2 cubic meters of wood, depending on how it was cut and how it is piled.
(pic unrelated)