What is the proper symbol for a three-way switch?

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Multiple Choice

What is the proper symbol for a three-way switch?

Explanation:
In this schematic notation, a switch is labeled with an S followed by a number to identify the type and position in the circuit. A three-way switch—the one that lets you control a single light from two locations—is designated with S3. That specific labeling distinguishes it from a generic switch (just S) and from a four-way switch (S4), which is used when there are three or more control points. The textual label 3W isn’t the symbol used in this diagram style, so S3 is the symbol that clearly identifies a three-way switch in these drawings.

In this schematic notation, a switch is labeled with an S followed by a number to identify the type and position in the circuit. A three-way switch—the one that lets you control a single light from two locations—is designated with S3. That specific labeling distinguishes it from a generic switch (just S) and from a four-way switch (S4), which is used when there are three or more control points. The textual label 3W isn’t the symbol used in this diagram style, so S3 is the symbol that clearly identifies a three-way switch in these drawings.

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