What is the meaning of alphabet on transistors ?

Normally there is two alphabet coading and after that there is some number on transistors  so let see what the alphabet  says .
Firat alphabet 

If A-one or more junction device and 0.6 to 1.0ev band gape deviec like zermenium.

If B-one or more junction device and 1.0 to 1.3ev band gape deviec silicon.

If C-one or more junction device and more then 1.3ev band gape deviec like gelium and arcenide.

if D-one or more junction device and less then 0.6ev band gape deviec like indinium antimonamide

If R- without any junction and used with photo conductive marerials

Now with second latter.
A- detecrion diode,hi-speed diode,mixture diode.
B- caaeiable capacitance diode
C-transistor for AF
D-power transistor for AF
E- tunnel diode
F-transistor for RF
G-dcmiller multiple  devices
H-field probe
K-hole generator (used in open magnetic circuit)
L- power transistor  for RF
M-hole generator (used in close magnetic circuit)
P-radiation sensitive device
Q-radiation generating device
R-Electrically triggered 'control' with breakdown characteristic and self switching device
S-transistor for switching application
T-Electrically triggered 'control' with breakdown characteristic and self switching decide  controlled with light
U-power transistor  for switching application
X-multiplier diode like varactor  or step recovery diode
Y-rectifier diode ,booster diode
Z-voltage refrance of voltage regulator diode

For digit
If there is three digit so it means it is cosumer goods ,if there is first 2 latter and then 2 digit it mean it is industrial  applications.




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