1 and "h" are commonly used in mathematics to represent the height of a figure in a geometric figure. The unit of time is also indicated in the calculation problem, and one hour is1h.

2. In chemistry, a chemical symbol representing elemental hydrogen, or 1 hydrogen atom, or a substance composed of atoms.

3. In mathematical geometry, lowercase h stands for height.

4. In Hubble's law, h stands for Hubble constant.

5. In quantum physics, it means "Hamiltonian", and lowercase h stands for Planck constant. (its value is about 6.626196×10-34j s)

6. In the international system of units, Henry's inductance unit.

7, in the drug approval with font size said chemicals.