14 stands for the 14 words, "We must secure the existence of our people and a future for white children." A phrase coined by David Lane, not George Rockwell, who instead started the term white power. 88 Can refer to HH, Heil Hitler, or to another of David Lane's works the 88 precepts. Which is an essay he wrote and is in his book. The other guy was close but still incorrect.
1488 refers to two works written by David Lane while he served his extremely long prison sentence for activities he did with Robert J Matthews and The Order. 1488 is a simplified code for general beliefs of many while power skinheads. White Pride 1488. Free the Order