Obtain model-specific identification before using uncertain settings. Similar-looking knobs can control gas, grill, oven functions or temperature, with different operating requirements.
What the observation means
An old photograph of your exact panel can help describe the issue, but a generic product image may show another revision. Guessing a label from the next knob risks selecting the wrong function.
A useful next step
Keep the full model reference and describe which legends are missing. Do not test unknown positions by watching for heat or flame. A compatible replacement fascia or knob may be possible, but its suitability must be established rather than improvised with arbitrary markings.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.