Do you put a period after ft?

Do you put a period after ft? *Note that other units of measurement, such as 18 km, 20 ft, and 5 m, do not require periods after the abbreviated unit unless they fall at the end of a sentence.

*Note that other units of measurement, such as 18 km, 20 ft, and 5 m, do not require periods after the abbreviated unit unless they fall at the end of a sentence.