A “landmark bridges sheetlet” refers to a collection of postage stamps (often in a small sheet or strip format) issued by a postal service (like India Post) featuring famous or iconic bridges, such as India’s Howrah Bridge, Pamban Bridge, or global icons like the Golden Gate Bridge, celebrating their engineering marvels and cultural significance. These philatelic items showcase different bridge designs (suspension, arch, cable-stayed) and are popular with stamp collectors.