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They are Bopomofos (注音符号): https://en.wikipedia.org/wiki/Bopomofo According to Wikipedia, Zhuyin fuhao, Zhuyin or Bopomofo is a system of phonetic notation for the transcription of spoken Chinese, particularly the Mandarin dialect.
说文解字：更易也。从辵虒聲。 Actually, 遞=辵+虒, it's a pictophonetic character which original meaning is "to alternate". The meaning radical(形旁) 辵 carries the basic meaning "to walk one moment and stop the next". The sound radical(声旁) 虒 only indicates the pronunciation of 遞(dì).
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