There are oven setting symbols that provide a visual shorthand for oven functions. Some of the most common symbols include a bar on the bottom and the top, indicating that both elements will be used with this setting for conventional heating. Bottom heat only is represented by a single lower bar. Convection heating is indicated by a fan. A zigzag line at the top represents the high heat emitted from the top element for broiling. Look for a plate graphic with steam lines above it to indicate the symbol for the keep warm setting. Note that the exact symbols may vary by brand and model. Note that the exact symbols may vary by brand and model.