PFRX means Preflight Relmat
X-1,2,3...9 or A,B,C...Z in
NASA
Similar to PFRX
$#!* - We Have a Problem
(H) - Hazardous
Task Classification
(S) - Safe
Task Classification
0G - Zero Gravity
2GRLV - 2nd Generation Return to Launch Vehicle
2IC - Second In Command
2M - Micro Miniature
View all in NASA