The Ancient Greek surely had a way with letters.

Α – Alpha waves are a type of brain waves that predominantly originate during wakeful relaxation with closed eyes.

Θ – Theta waves are a type of brain waves associated with creativity and dreams.

Κ – Connectivity is one of the basic concepts of graph theory. The connectivity of a graph is an important measure of its robustness as a network.

Φ – The golden ratio, also known as the divine proportion, golden mean, or golden section, is a number often encountered when taking the ratios of distances in simple geometric figures.

This is not rock music.

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