Signal, Sign
noun, verbal noun
A diagram everyone joins together to see is a signal or a sign.
あいず
This word uses the kun'yomi reading for 合 and the on'yomi reading for 図. You know them both now, so you should be able to read this too!
私が合図をしたら、大きくジャンプをしてください。
When I give the signal, please jump high.
サムは、親指を上げて合図を送った。
Sam gave the signal by raising his thumb up.
それがスタートの合図でした。
That was the signal to start.