What is the difference between LSZH, LSOH, and LSHF?

These terms are essentially interchangeable in the international market:

LSZH: Low Smoke Zero Halogen (most common).

LSOH / OHLS: Low Smoke Zero Halogen / Zero Halogen Low Smoke.

LSHF / NHFR: Low Smoke Halogen Free / Non-Halogen Flame Retardant. All these designations point to the same safety goal: reducing toxic fumes and maximizing visibility during fire emergencies.