surface of equal density

surface of equal specific volume

equal treatment

curve of equal bearings

line of equal pressure

naval surface forces, surface fleet, surface forces

density of a surface source

surface-to-surface artillery

surface-to-surface missile (SSM)

ballistic surface-to-surface missile

control surface / control-surface

guided surface-to-surface missile

surface-to-surface

surface-to-surface delivery system

surface-to-surface missile (rocket)

density of explosive

gas density

high-density metal

loading density

low-density minefield

pattern density function

traffic density

antitank density

high-density airspace control zone (HIDACZ)

high density shock tube

density of travel

ambient density

density balance

density altitude display (DAD)

atmospheric density

standard density

density gradient

density meter