Philips 2N6027 Thyristor, PUT - Programmable Unijunction Transistor, 
PUTs 40V, 300mW,
Case type: TO92 3pin,
1 Anoda
2 Gate
3 Katoda 

Application includes thyristor–trigger, oscillator, pulse and timing circuits.
These devices may also be used in special thyristor applications
due to the availability of an anode gate..