спішне донесення, терміновий лист
dead letter-box
letter bomb (parcel bomb, mail bomb, postal bomb etc)
letter of instruction
letter order
letter of agreement
letter of commendation
action letter
immediate action letter
call letter
recruitment letter
command letter
supersonic speed (exceeds speed of sound / Mach 1)
variable-speed with speed control
instantaneous vertical speed indicator / instantaneous vertical-speed indicator (IVSI)
cruise speed / cruising speed
Nr gauge (Nr = speed of rotation) / rotor speed sensor
apparent speed
average speed
blade speed
convoy speed
critical speed
cross-country speed
cruising speed
endurance speed
exhaust speed
full speed (naut.)
gear speed decreaser
group transit speed
high-speed antiradiation missile (HARM)
high-speed boat
hypersonic (speed)
lightweight high-speed antisubmarine torpedo