'Memorial' in the Bible

‘Now this day will be a memorial to you, and you shall celebrate it as a feast to the Lord; throughout your generations you are to celebrate it as a permanent ordinance.

Then the Lord said to Moses, “Write this in a book as a memorial and recite it to Joshua, that I will utterly blot out the memory of Amalek from under heaven.”

You shall put the two stones on the shoulder pieces of the ephod, as stones of memorial for the sons of Israel, and Aaron shall bear their names before the Lord on his two shoulders for a memorial.

Aaron shall carry the names of the sons of Israel in the breastpiece of judgment over his heart when he enters the holy place, for a memorial before the Lord continually.

You shall take the atonement money from the sons of Israel and shall give it for the service of the tent of meeting, that it may be a memorial for the sons of Israel before the Lord, to make atonement for yourselves.”

And he placed them on the shoulder pieces of the ephod, as memorial stones for the sons of Israel, just as the Lord had commanded Moses.