Enter a clue or pattern or both:
The Clue
Kind of S.D.I. weapon (4 letter answer)
The Answer
ASAT
Tags
Notes
The answer ASAT is so rare that it appears less than once every 2500 puzzles.
Definition
ASAT as an adjective:
1. (antisatellite, ASAT) = of or relating to a system to destroy satellites in orbit; "antisatellite weapons"