Which of the following self-assigned indicators are acceptable when using a phone transmission?

Self-assigned indicators, such as strokes or slants, are often used in amateur radio to indicate the location or operational condition of the station. When using a phone transmission, operators can employ these indicators to clarify their situation or the location they are operating under.

In this context:

• The use of a "stroke," often represented with an appropriate character, denotes a specific operating condition or location, in this case, indicating that the operator is transmitting from a different area than their primary call sign indicates.

• The "slant" and "slash" indicators serve similar purposes; they help to provide context about the operating location or special circumstances under which the operator is transmitting, which can be crucial for other operators to understand.

All these variations—stroke, slant, and slash—are conventional practices within amateur radio. They are all professionally recognized methods of self-assigning indicators that provide crucial information about the operator's conditions. Consequently, the acceptance of all these forms in a phone transmission aligns with the practices established in amateur radio regulations.