'Memorial' in the Bible

“Instead of the thorn bush the cypress tree will grow,And instead of the nettle the myrtle tree will grow;And it will be a memorial to the Lord,For an everlasting sign [of His mercy] which will not be cut off.”

To them I will give in My house and within My walls a memorial,And a name better than that of sons and daughters;I will give them an everlasting name which will not be cut off.