Resources What is SPL? | QUICK EXPLANATION! by Stuart Charles Black November 19, 2016 by Stuart Charles Black November 19, 2016 Updates 2/19/19. 2/6/21. Article/link cleanup. 540-word post, approx 1-2 min. read This is part of a FAQ series! Please share and comment if you found any of these articles helpful… 0 FacebookTwitterPinterestEmail