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## Possible Answers:
**ULTRA**.

**ULTRA**.

Last seen on: –LA Times Crossword, Tue, Dec 12, 2023

–Vulture Wednesday, 22 November 2023 Crossword Answers

–The Telegraph – QUICK CROSSWORD NO: 30,353 – Jul 15 2023

–The New Yorker Tuesday, 20 June 2023 Crossword Answers

Thomas Joseph – King Feature Syndicate Crossword – Nov 29 2022

### Random information on the term “Extreme”:

In mathematics, an extreme point of a convex set S {\displaystyle S} in a real or complex vector space is a point in S {\displaystyle S} which does not lie in any open line segment joining two points of S . {\displaystyle S.} In linear programming problems, an extreme point is also called vertex or corner point of S . {\displaystyle S.}

Throughout, it is assumed that X {\displaystyle X} is a real or complex vector space.

For any p , x , y ∈ X , {\displaystyle p,x,y\in X,} say that p {\displaystyle p} .mw-parser-output .vanchor>:target~.vanchor-text{background-color:#b1d2ff}lies between x {\displaystyle x} and y {\displaystyle y} if x ≠ y {\displaystyle x\neq y} and there exists a 0 < t < 1 {\displaystyle 0<t<1} such that p = t x + ( 1 − t ) y . {\displaystyle p=tx+(1-t)y.}

### Random information on the term “ULTRA”:

The Enigma machine is a cipher device developed and used in the early- to mid-20th century to protect commercial, diplomatic, and military communication. It was employed extensively by Nazi Germany during World War II, in all branches of the German military. The Enigma machine was considered so secure that it was used to encipher the most top-secret messages.

The Enigma has an electromechanical rotor mechanism that scrambles the 26 letters of the alphabet. In typical use, one person enters text on the Enigma’s keyboard and another person writes down which of the 26 lights above the keyboard illuminated at each key press. If plain text is entered, the illuminated letters are the ciphertext. Entering ciphertext transforms it back into readable plaintext. The rotor mechanism changes the electrical connections between the keys and the lights with each keypress.

The security of the system depends on machine settings that were generally changed daily, based on secret key lists distributed in advance, and on other settings that were changed for each message. The receiving station would have to know and use the exact settings employed by the transmitting station to successfully decrypt a message.