Passage: In some languages and cultures, the same word or gesture is used as both greeting and farewell.  Examples are "Good day" in English, "Sat Shri Akaal" in Punjabi, "As-Salamualaikum" in Arabic, "Aloha" in Hawaiian, "Shalom" in Hebrew, "Namaste" in Hindi and "Ciao" in Italian.  The bow and handshake are also used for both greeting and leave taking.

Question: A same word or gesture can mean what two things?
greeting and farewell