The square was used until the last century as a field of military exercises.

This small square was, notwithstanding the name, never used as a market.

The square was also used as the place of executions.

The square is also used to divide the city into quarters.

The least squares method is used to determine the best fit line for a set of data.

Since its creation, the square has been used for a number of important party rallies.

This square has since that time been used for purposes of meetings.

To get estimates for an over determined system, least squares can be used.

Only the dark squares of the checkered board are used.

If not, weighted least squares or other methods might instead be used.