what's in a degree ?

Unit of measurement of temperature. The symbol is °C, equal to one hundredth part of the difference between the melting temperature of ice (0°C) and the boiling temperature of water (100°C) under normal atmospheric pressure. 

A degree can also be used to measure an angle. For exemple in triangle or in a square.

The kelvin (K) is the SI unit of temperature. It measures absolute temperature, a quantity defined by thermodynamics. This absolute temperature scale uses degrees Celsius, but starts at absolute zero, approximately -273°C. The melting temperature of ice is 273°K.

Unit of temperature measurement used in some countries (0°C corresponds to 32°F). Degree of heat measured via a value scale determined by the German physicist Daniel Fahrenheit in the 18th century and bringing the melting point of water to 32 degrees and that of its boiling to 212 degrees.