I is a vowel, and vowels in words usually have two pronunciations:

1, the sound of the letter itself /ai/ (usually at the opening syllable), such as:

Kite: English [kat] beauty [kat], kite.

Bicycle: Britain [bak] America [bak], bicycle.

2. Short /i/ (usually in closed syllables), such as:

Hit: Britain [ht] America [ht] hit.

Bit: Britain [bt] and the United States [bt] a little.

meaning

In mathematics, it means identity matrix. That is, a matrix with all diagonal elements of 1 and all off-diagonal elements of 0. It also represents the slope ratio, that is, i= vertical height/horizontal width (if α is the inclination angle, i=tan α).

In chemistry, a chemical symbol representing elemental iodine.

The atomic number of elemental iodine is 53 and its relative atomic mass is 126.9.

In physics, the variable I represents current, and the unit is A. In electricity, I represents current, and in optics, I represents light intensity.

In mathematics, I stands for the imaginary (√- 1) unit in the complex number. The square of I is-1. I is the square root of (-1). The radical I is equal to: (√2)( 1+i)/2.