noun
split-flap display
A mechanical information display board that uses flipping character panels, commonly seen in train stations and airports for departure/arrival information.
駅の反転フラップ式案内表示機が、パタパタと音を立てて行き先を更新した。
The split-flap display at the station updated the destinations with a fluttering sound.
Compound of 反転 (reversal), フラップ (flap), 式 (style), 案内 (guidance), and 表示機 (display device). The term describes the mechanical flipping mechanism used to show information.