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What is the symbol that is below the C1 capacitor and R1 resistor. Is it the symbol of grounding?

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    \$\begingroup\$ This question has little to recomend it - it doesn't seem that you did much work yourself to find an answer, and the answer is rather trivial. \$\endgroup\$ – Sean Houlihane May 31 '16 at 12:53
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The symbol represents signal ground. This ground is often connected to the usual ground of a device, commonly known as "earth". However if a system is very sensitive the two grounds cannot simply be connected, but require a thorough engeneering approach and a good ground able to handle high currents.

More info on the grounding types:

https://en.wikipedia.org/wiki/Ground_(electricity)#Electronics

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  • \$\begingroup\$ I think ground is usually represented using the vertical line connecting with a series of horizontal lines in a triangular shape symbol. Ground, 0V, earth and equipotential level may be synonymous in some circuits/applications but there are subtle or critical differences in others. \$\endgroup\$ – TafT May 31 '16 at 16:28
  • \$\begingroup\$ The symbol shown is signal ground. The series of horizontal lines forming a triangular shape is circuit ground, and the horizontal line with vertical lines coming off of it (that looks like a fork) is earth ground. \$\endgroup\$ – DerStrom8 May 31 '16 at 23:52
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It means Equipotential level. Often used, in CAD, for analog ground or signal ground. See IEEE STANDARD 315-1975 - "IEEE Standard for Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters)"

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Yes it is. Gound or zero potential depending on your application.

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