保 留 bǎo liú : continue to have; retain; hold back; reserve; reservations; hold back (approval or acceptance); to preserve; maintain

留 «畄» liú : leave (message); to retain; to stay; to remain; to keep; to preserve

Big5: , Unicode: 7559 (留),
Links: MT, Cantonese, Ld, Chinese Language

直 通 車 zhí tōng chē : "through train" (refers to the idea of retaining previous legislature after transition to Chinese rule in Hong Kong or Macao)