At the Last Supper, when Jesus took the bread and gave thanks, what did He say it was?

'This is My body, given for you; do this in remembrance of Me.' An ordinary loaf becomes a sign of self-giving — the same broken bread the Emmaus disciples would later recognize Him by.

Luke 22:19 · BSB

“And He took the bread, gave thanks and broke it, and gave it to them, saying, “This is My body, given for you; do this in remembrance of Me.””