°C: This is the most common temperature scale in the world and the simplest to understand.
Put simply, 0°C is the freezing point of water and 100°C is the boiling point of water.
Centigrade is an old fashioned name for Celsius.
You can abbreviate it to °C.
The scale is named after Swedish scientist Anders Celsius (1701-1744).
Centigrade is the old fashioned name for Celsius.
The name Centigrade was derived from the latin - meaning hundred degrees.
When Anders Celsius created his original scale in 1742 he inexplicably chose 0° for the boiling point and 100° for the freezing point.
One year later Frenchman Jean Pierre Cristin proposed an inverted version of the scale (freezing point 0°, boiling point 100°). He named it Centigrade.
In 1948, by international agreement, Cristin's adapted scale became known as Celsius to honour the Swedish Scientist.

°F: Fahrenheit is still in everyday use in the USA and preferred by older people in the UK.
In Fahrenheit the freezing point of water is 32°F and the boiling point is 212°F.
You can abbreviate it to °F.
The scale is named after its originator Gabriel Fahrenheit (1686-1736).

To convert between Centigrade or Fahrenheit you can use this application.
So, please download it and use by now.