The evidence for the continuing accretion of gas by the Milky Way involves high-velocity clouds, or HVCs--mysterious clumps of hydrogen, moving rapidly through the outer regions of the galaxy.
HVC is a mnemonic device used to describe high velocity clouds.
HVC is an acronym, which is considered a mnemonic device. The system definitely takes issue with this term.
( z1 device :mod ( z2 mnemonic ) :ARG1-of ( z3 use :ARG2 ( z4 describe :ARG1 ( z5 cloud :mod ( z6 velocity :ARG1-of ( z7 high ) ) ) ) ) :domain ( z8 thing :name ( z9 name :op "HVC" ) ) )