What does LD/SD stand for?

MLA style: "LD/SD." Acronym Finder . 2012. AcronymFinder.com 11 Feb. 2012 http://www.acronymfinder.com/Look-Down%2fShoot-Down-(LD%2fSD).html
Chicago style: Acronym Finder . S.v. "LD/SD." Retrieved February 11 2012 from http://www.acronymfinder.com/Look-Down%2fShoot-Down-(LD%2fSD).html
APA style: LD/SD. (n.d.) Acronym Finder. (2012). Retrieved February 11 2012 from http://www.acronymfinder.com/Look-Down%2fShoot-Down-(LD%2fSD).html

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Linear Dispersive Space-Time (coding scheme) Linear Dispersion Space-Time Block Code Linear Dispersion Space-Time Code Load Variable Laser Desorption/Ionization with a Fourier Transform Ion Cyclotron Resonance (mass spectometry) Low Density / High Demand Line of Departure/Line of Contact Lateral Dorsal/Lateral Posterior Complex Laser Designator/Rangefinder Lighting Designer, Sound Designer (theater and film)		Laser Designator/Weapon System Simulator Luminal Diameter to Wall Thickness Lactate Dehydrogenase 1 Leishmania DNA 1 Lethal Dose 100 percent (dose having 100% probability of causing death) Levee District 3 (California) Ludum Dare 48 (gaming) Learning Design for Practitioners Lactate Dehydrogenase Isoenzyme-5 (liver protein) Lethal Dose 50 (median concentration of a toxicant that will kill 50% of the test animals within a designated period)