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I came across the following schematics on a TV main board.

enter image description here

And a bit lower

enter image description here

I try to understand the meaning of the name of different rails. I suspect that STB means standby.

Does the following notations refers to some kind of standard notations ?

_M, _AUDAC, _EMMC, _STBC, _M_SIFADC, M_TVADC

Same question for the non prefix CORE

Full schematics can be found here https://www.electronica-pt.com/esquema/func-fileinfo/83341/

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    \$\begingroup\$ No, they’res no standard for these names - you have to figure them out by context. Audac is probably audio digital to analog converter, emmc is probably the flash storage device, stbc probably standby controller, core is the cpu core, m is probably memory, sifadc is some sort of adc etc. \$\endgroup\$
    – Kartman
    Commented Nov 10, 2022 at 10:27
  • \$\begingroup\$ The names are specific to that chip or that board. We can only guess their purpose without knowing the chip data sheet, but e.g. XTAL could be for crystal oscillator and all the interfaces may have their own supply pin to select the voltage used for that interface. \$\endgroup\$
    – Justme
    Commented Nov 10, 2022 at 11:55
  • \$\begingroup\$ Those names are whatever the drawer of the schematic (usually the designer) decided to use. Their meaning is probably crystal clear to the designer, not so much to a 3rd party. \$\endgroup\$
    – SteveSh
    Commented Nov 10, 2022 at 13:27
  • \$\begingroup\$ Note that depending on the tool and when that schematic was created, there may have been a limitation on how many characters could be in a signal name. Some of the early EDA tools restricted you to 12 or 16 characters, which led to some rather creative signal names. \$\endgroup\$
    – SteveSh
    Commented Nov 10, 2022 at 13:29

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