An identity matrix is a square matrix in which all the elements on the diagonal are 1 and all other elements are 0.

An imaginary unit is an important concept in mathematics.

An astronomical unit represents the average distance from the Earth to the Sun.

This product has a very small assembly unit.

He has a beautiful scroll.

How wide is this table?

This internet connection has a wide bandwidth.

In the new house, white skirting boards are installed.

This computer operates in nanoseconds.

This program operates in milliseconds.