Square Nanometer [nm²]
A square nanometer (nm²) is a unit of area equal to a square with sides 1 nanometer long (1 nm = 1 billionth of a meter, or 10⁻⁹ m).
It’s used to measure extremely tiny areas, like the surface of molecules or nanomaterials.
1 nm² = 1 × 10⁻¹⁸ m².
Rood
A rood is a historic unit of area used primarily in England and some other countries for measuring land.
1 rood = 1/4 of an acre
1 rood = 10,890 square feet ≈ 1,012 square meters
4 roods = 1 acre
The rood was traditionally used for measuring small plots of land, especially in farming and real estate.