The highest setting on an iron is typically labeled as "Linen" or "Cotton" on the iron's temperature control dial. The specific labeling might vary slightly depending on the iron's manufacturer and model. The Linen or Cotton setting usually corresponds to the highest temperature setting, which is the hottest setting meant for ironing heavy fabrics like linen or cotton that can withstand high heat.
It's essential to use the appropriate setting for the fabric you are ironing to avoid damaging delicate fabrics or scorching more sensitive materials. Always check the care label on your clothing or fabric to determine the appropriate ironing temperature. If in doubt, you can start with a lower setting and gradually increase the temperature as needed while testing on an inconspicuous area of the fabric.