Gas filled tubes
Gas filled tubes can be divided into the following groups:
Used as surge arresters, for voltage limitation,  stabilization or as reference source. 
  • Cold cathode trigger tubes. These have an extra electrode for ignition.
Switch tube for relays etc.
Light detectors and switches.
For detection of X-rays, alfa, beta and gamma particles
  • Thyratrons are triodes or tetrodes filled with an inert gas like Argon, Helium or Xenon.
  Used as an electronic relay in various applications including radar pulse units.
Surge arresters
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4369
 
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4370
 
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4372
 
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4378
 
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4379
 
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4399
 
Discharge tubes - stabilizer

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This is not really a stabilizer. It is a small neon lamp that ignites at approx. 60 V. It was used as a voltage limiter in some old Tektronix and Hewlett-Packard instruments.
 Hivac XC15
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0A2
 
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0A3/VR75
 
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0B2
 
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0B3
 
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0C2
 
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0C3
 
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0D3/VR150
 
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100E1
 

150C1K
 

150C1P
 
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4687K
 
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7475
 
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STV150/15
 

STV150/60
 
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STV280/80
 
Voltage references
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83A1
 
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85A2
 
 
Trigger tubes
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0A5
 

V2030E/CV349
 
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ZA1000
 
Gas rectifier
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0Z4
 
  .
Thyratrones - triodes
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884
 

EC50
 
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PL5557
 
Thyratrones - tetrodes
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2D21/PL2D21/EN91
 
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2050W
 
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PL1607
 
Noise diodes for microwave
K50A
K51A

K81A