What does LESS stand for?

La Esperanto-Spiritista Societo (SAUO)

LASER-Excited Shpol'skii Spectrometry

Lateral Electrical Spine Stimulation - Orthopedics (DAVI)

Launch Escape System Simulator - NASA (IAA)

Law Encounter Severity Scale - Personality development test - Psychology

Leading Edge Structure Subsystem - Aviation (NASA)

Leading Edge Subsystem (NAKS)

Least-Cost Estimating and Scheduling System

Lunar Escape System Simulator - NASA

Lessing - Botanist in plant scientific name (HUH)