IN-7B tubes display the following scientific symbols: Ω,V,Hz,S
Working Voltage: 150V- 170V. Working Current: 2.5 mA.  These large nixie tubes look very beautifully and have warm, comforting orange/violet glow. 
Electrical parameters:
Brightness     >=100cd/m^2
Angle of visibility     >= 90 deg
Power supply voltage     >= 200 V
Discharge appearance voltage     <= 170 V
Discharge voltage:     <= 150 V
Display current     <= 4 mA
Operations current: Running from DC     4 - 7 mA
Running from AC with 50 Hz (average value)     2 - 4 mA
Life time     >= 5000 hours