What type of sign is a yellow pennant?

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A yellow pennant-shaped sign is used to mark the beginning of a no-passing zone on a two-lane road. The pennant shape plus the yellow color tells you to proceed with caution and that passing other vehicles is not allowed ahead, because sight distance or road conditions won't safely allow it. This is why the correct interpretation is that it indicates no passing. It’s different from a stop sign (red and octagonal) and a yield sign (red-bordered triangle), and it’s distinct from general warning signs (typically yellow diamonds) because the pennant shape is specifically for the start of a no-passing restriction.