factor IV (noun)

1. Why did the calcium ion go on a date with the magnesium ion? Because they had great chemistry!

2. In ancient Greek mythology, the factor IV was believed to be the divine essence of calcium.

3. The author beautifully described the enchanting effect of factor IV on the protagonist's journey in the novel.

4. Factor IV is regarded as sacred in some religious ceremonies, as it symbolizes the purity of calcium ion.