For example:

The height of a cuboid is expressed by h, and the letter formula is V=lwh.

In mathematics, h sometimes represents the height of a plane figure. For example, the height of a parallelogram is represented by h, and the formula is S=ah.

The height of the triangle is expressed by H, and the letter formula is S=ah÷2.

Extended data other meaning:

The letter H stands for hexadecimal number (hex), which is one of each hexadecimal number, that is, the radix R= 16. The suffix H or subscript 16 is usually used to indicate the difference. H) letters represent hexadecimal numbers (hex. Hexadecimal number is composed of 0 ~ 9 and sixteen characters of A, B, C, D, E and F (they respectively represent decimal number 10 ~ 15), and the operation rule of hexadecimal number is one per hexadecimal.

Planck constant, named H, is a physical constant that describes the quantum size. It plays an important role in quantum mechanics. When Max Planck studied the law of thermal radiation of objects in 1900, he found that as long as the emission and absorption of electromagnetic waves were not continuous, but one after another, the calculated results could be consistent with the experimental results.

Baidu Encyclopedia -H (high abbreviation of object (or figure))