Mutual funds that do not charge an upfront or back-end commission , but instead take out up to 1.25% of average daily fund assets each year to cover the costs of selling and marketing shares , an arrangement allowed by the SEC's Rule 12b-1 (passed in 1980).
12B-1 FUNDS
Meaning of 12B-1 FUNDS in English
Campbell R. Harvey. Hypertextual finance English glossary. Английский словарь гипертекстовых финансов. 2012