I think the correct term is 'dividend'. Stocks and bonds both have these, after prescribed periods periods or they can be announced out of the blue, when a company is doing well and wants to encourage buying pressure on their stocks. So, these additions to your SP should be called 'dividends'. But by the same token, interest payments work the same way. In margin lending facilities at exchanges, you get regular payments on every loan as it matures from the funds you place on deposit. So it's similar to that as well, basically like a term deposit.