Greek letters are commonly used in science. There are 24 Greek letters.

Here are the ones we have discussed recently.
| Greek letter | Name | Uses |
| α | alpha | alpha particles, indicates the first angle of a triangle opposite the side a |
| β | beta | beta particles, indicates the second angle of a triangle opposite the side b |
| γ | gamma | gamma rays, indicates the third angle of a triangle opposite the side c |
| θ | theta | commonly used to indicate an angle |
| λ | lambda | wavelength |
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