Or tung oil.
Both linseed oil and tung oil harden (polymerize) so they are no longer "oils" but a harder finish. Boiled linseed oil is linseed oil that has been heated, partially polymerized, and evaporating solvents added. This speeds up the "drying" process (polymerizing) so it takes days and not weeks.
The same thing is done to prepare tung oil instead of using raw tung oil.