In homeopathy, "potency" is the degree of dilution of the remedy.
The letter indicates the dilution ratio under which the potency series is produced, while the Arabic numeral indicates the number of potency steps.
For example, the decimal potency D4 has been diluted four times in a ratio of 1:10 and has been dynamized by 10 shaking strokes at each step.
C-potencies, (centesimal, from Latin centum for 100) are processed in the ratio 1:100.
LM-potencies and Q-potencies are potentiated in steps of 50,000.
(LM Quinquaginta Mille, 50,000 in roman numbers in multiplication notation Q Quinquagintamillesimal potency = 50,000)
As the number of potentiation steps increases, the content of the initial substance in the remedy decreases, but its energetic value is increased by repeated dynamization.