What is the traditional keyboard of Thinkpad notebook? What is the technical term? Thank you.

Full name: seven rows of duckweed keyboards. History: 20 years, starting from the first ThinkPad in 1992. Features: 1, X drum structure, more complicated than the general keyboard, which makes the keystroke and feedback force balanced and stable, which is the fundamental reason for its good feel. 2, little red dot, pointing stick, is a set of mice. 3, blue enter key, different colors of high-frequency keys. 4. The function key is located at the lower left, which is convenient to directly locate the function function. 5, splash-proof, liquid will flow out from the bottom of the notebook after entering. 6, quick release, generally only need to remove 2~3 screws from the D side, you can directly remove the keyboard from the C side without removing the notebook. Update: The new generation keyboard is called six-row island keyboard. The T, X and W series retain the three characteristics of 1, 2, 4, 5 and 6, and the essence is still there, which is confirmed by personal experience. Both Edge and X 1 Carbon have 1, 2, 4, 5, but the keyboard of Carbon feels good, but Edge doesn't, especially the last row (the row of keys with spaces) is too big, which is out of harmony with the above rows, because it combines the size of direction keys, just like the keyboard of a Macbook.

Satisfied, please adopt.