What are the naming methods for lamp holders?

Part (a) of the symbol consists of one or more capital letters, indicating the type of lamp cap. Although the following letters indicate the lamp base, they have similar meanings for the lamp holder.

B--Bayonet lamp holder;

BA--Bayonet lamp cap, originally used for car lights;

BM--Bayonet lamp holder for miner's lamp;

E-- (Edison) screw cap;

F--A lamp base with one contact;

The lowercase letter after the letter F indicates different forms of contacts, for example:

A--Indicates a cylindrical pin;

B--Indicates the pin with groove;

C--Represents the pin with special shape;

G--Two or more protruding contacts, such as pins or terminals;

K--Lamp head with wire connection;

P--pre-focused lamp head;

R--Lamp head with concave contact;

S--Shell-type lamp holder--The lamp holder is not fixed by protruding parts in the lamp holder

SV--Shell-type lamp cap with tapered end (V-shaped);

T--Telephone holder;

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