How to read this moment of the E4 scheme?

A

Alexander2021-04-19 13:15:15

Electronics

Alexander, 2021-04-19 13:15:15

The cable goes to the sockets that are in another case. What is the designation for the designation on the cable, some kind of rectangle And what is the dotted circle around the cable?

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O

Ocelot, 2021-04-19
@Shemapp

Rectangle - sealed entry (GOST 2.702-2011).
Dotted circle - shielded cable (GOST 2.721-74).