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What is that red symbol on the schematic?

enter image description here

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I would say that is a group of solder pads that are used as jumpers - short the center and top pads with a blob of solder to select one function, and bottom and center for the other.

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    \$\begingroup\$ It is indeed a 3-way Surface-Mount (SMD) jumper. I used these A LOT for physical debugging purposes \$\endgroup\$ Oct 2, 2022 at 19:31
  • \$\begingroup\$ Isn't something like that tool, or company dependent? \$\endgroup\$
    – SteveSh
    Oct 2, 2022 at 21:22
  • \$\begingroup\$ @SteveSh: Yes. Both the schematic symbol and pcb footprint may vary between designers, or even between jobs for a given designer. \$\endgroup\$ Oct 2, 2022 at 21:46
  • \$\begingroup\$ +1 In this case, it might be used for address selection for an I2C peripheral. \$\endgroup\$ Oct 3, 2022 at 1:55

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