The phrase "predetermined number" means a specific or fixed number that has been decided or established in advance, rather than being chosen at random or based on current circumstances. Full definition
The Bitcoin Network's mathematical protocols under which Bitcoins are created or «mined» permit the creation of a limited, predetermined number of Bitcoins not to exceed 21 million. (sec.gov)
The content, which can be accessed from any internet - ready computer or tablet, is not limited by the bounds of typical library licensing in which there are predetermined numbers of check outs or patron use. (goodereader.com)
The equity can be a predetermined number of restricted shares, or a set monetary amount in the form of share «units.» (canadianbusiness.com)