Q: How meteorologists (weather scientists) came up with the map symbol for an occluded front.

Flexi Says: An occluded front usually forms around a low pressure system. The occlusion starts when a cold front catches up to a warm front. The air masses, in order from front to back, are cold, warm, and then cold again. The map symbol for an occluded front is mixed cold front triangles and warm front domes.