I'm still thinking, a little, and all I'm getting is:

HVAC - Heating, Venting, Air Conditioning
ST - SuperThrive - An additive for nutrients, mostly B1 but many other ingredients. Many people in this forum swear by it. Used clone through veg stages, especially to promote big, healthy root growth. Looks expensive, but a gallon needs only 2 drops.
LQ - Liquid Karma - Another great additive, used during blooming too.