pi

The number, about 3.14, found by dividing the distance around a circle by its width through the centre.

• Pi is approximately 3.14.
• Multiply the diameter by pi to find the distance around a circle.
• How many digits of pi can you remember?

Common phrases: value of pi, digits of pi, times pi

The Greek letter written as π in its small form and Π in its capital form.

• Pi is a Greek letter.
• Write a lowercase pi beside the diagram.
• The symbol on the sign is a capital pi.

Common phrases: letter pi, capital pi, lowercase pi

Describing printing symbols or letters outside the usual set of Latin letters and numbers.

• The printer used a pi font for the symbols.
• Pi characters include special signs for technical texts.
• The typesetter selected pi symbols for the equation.

Common phrases: pi characters, pi font, pi symbols