Flint is a specialized heraldic charge that represents both a vital natural resource and the spark of human ingenuity. In a display of arms, it is rarely shown as a raw, geological specimen; instead, it is typically depicted as a flapped or knapped piece of stone or as part of a flint and steel set (striker and stone). Historically, it is an emblem of readiness and zealous service, symbolizing the ability to create light and heat from cold, hard materials (My Lineage; Hall of Names).

The symbolism of flint is fundamentally tied to fire-making and defense. Because fire is essential for survival, the flint represents providence and preparation. When paired with a "steel" or "furison" (the metal striker), it underscores a proactive nature—the "spark" of a quick wit or a fierce spirit that only needs a strike to ignite into action. In some traditions, it also carries connotations of endurance and hardness, reflecting a person or community that remains firm under pressure but possesses an internal "fire" that can be drawn out when necessary (Master Woodsman).

Examples of flint in heraldry are often found in "canting arms" (visual puns on a name) or in the arms of places historically significant for flint mining or building. A notable example is the Order of the Golden Fleece, which prominently features the furison and flint as decorative elements in its collar, where the sparks represent the "fire of charity" or the Zeal of the House of Burgundy. You can also find flint in the civic heraldry of towns in East Anglia (like Norfolk and Suffolk), where knapped flint was a primary building material for churches and fortifications (Wikipedia). For visual references of flints and fire-steels in various arrangements, explore Category:Firesteels in heraldry and Category:Flints in heraldry on Wikimedia Commons.