Energy Sword Sunday is a recurring internet tradition within the gaming community, particularly among Halo fans. It typically involves posting images of characters, pets, or objects wielding the iconic Sangheili Energy Sword every Sunday. The meme gained significant traction on platforms like Twitter and Reddit, often accompanied by low-quality or 'deep-fried' images to evoke a sense of nostalgic internet culture. It serves as a lighthearted weekly ritual that celebrates Halo's most recognizable melee weapon while building a sense of community among players who have spent decades mastering the art of the sword lunge.