雷达

radar (loanword)

surname Lei

thunder / mine (weapon) / (Internet slang) terrifying / terrific

thunder / (bound form) (military) mine, as in 地雷[di4 lei2] land mine / (coll.) to shock; to stun; to astound / (Tw) (coll.) spoiler / (Tw) (coll.) to reveal plot details to (sb)

surname Da

to attain / to reach / to amount to / to communicate / eminent

transponder / electronic device that responds to a radio code

radar antenna

optical radar (lidar)