Per the ref quoted below from the link below, another common term for “correction factor” is “Insulin sensitivity factor” or ISF.
Your ISF is the amount 1 unit of insulin will decrease your Blood Glucose. In the United States, this is measured in mg/dL (milligrams per decilitre). The number will look differently in other countries where BG is measured in mmol/L (millimoles per liter).
A pump uses the ISF (or CF) to determine how much insulin to bolus to correct a high BG. You divide the amount you want your BG to decrease by the ISF to get the amount of insulin for the bolus. Because you are dividing by the ISF, a smaller ISF results in a larger bolus.