The kanji 搭 primarily conveys the meaning of "to load," "to board," or "to put on". It implies the act of getting onto something like a vehicle, or building something on top of something else. It also relates to the act of constructing or erecting.

・On-yomi (音読み): トウ (tou) ・Kun-yomi (訓読み): 搭（の）る (no(ru)) - to board, to ride; 搭（かける） (kake(ru)) - to put on, to hang on

⚫︎搭乗 Translation: boarding (e.g., an airplane) ⚫︎搭乗券 Translation: boarding pass ⚫︎搭のビル Translation: the building which is built on the top

The kanji 搭 is a phono-semantic compound (形声文字, keisei moji). The semantic component is the radical 手 (て, te) meaning "hand". The phonetic component is 荅 (tou), which provides the sound and hints at the meaning. The original meaning of this character was to add, and then extended to the meaning of "to load", "to board". The inclusion of the radical 手 (hand) hints at the act of physically adding or putting something on.