IV-3
Luminescent vacuum subminiature indicator. 
Designed to generate numbers (0...9) and a decimal point (comma) from separate luminous segments located in the same plane in computer technology devices.

Characteristics
Sign size 5.9 x 9.1 mm
Glow intensity not less than 500 cd / m²
Number of segments 8
Filament voltage 0.7 ... 1 V
Mains voltage 30 V
Voltage of anodes - segments 30 V
Filament current 45 ... 55 mA
Grid current not more than 5 mA
Anode current - segments not more than 0.3 mA
Ready time no more than 1 s
Minimum operating time 3000 h