The 'phew, that was close' laugh — squinting eyes and an open grin capture relieved, almost-too-much laughter, often paired with a joke that landed a little too well. Some platforms (notably older Google renderings) drew this with visible sweat, blurring it with the laughing-with-sweat emoji and causing years of cross-platform confusion.
Keywords: closed, eyes, face, grinning, haha, hahaha, happy, laugh, lol, mouth, open, rofl, smile, smiling, squinting