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  2. Prehn's sign - Wikipedia

    en.wikipedia.org/wiki/Prehn's_sign

    According to Prehn's sign, the physical lifting of the testicles relieves the pain of epididymitis but not pain caused by testicular torsion. [ 4 ] Negative Prehn's sign indicates no pain relief with lifting the affected testicle, which points towards testicular torsion which is a surgical emergency and must be relieved within 6 hours.

  3. Phren - Wikipedia

    en.wikipedia.org/wiki/Phren

    Phren, however, is not exclusively applied to humans. In Empedocles' system, Phren is a general psychological agent to which moral blame and praise can be extended, [4] that darts through the universe as effluences, steers and controls the cosmos in the process and is the measure of what is harmonious and what is fit to exist. [5]

  4. False positives and false negatives - Wikipedia

    en.wikipedia.org/wiki/False_positives_and_false...

    The false positive rate (FPR) is the proportion of all negatives that still yield positive test outcomes, i.e., the conditional probability of a positive test result given an event that was not present.

  5. Positive and negative predictive values - Wikipedia

    en.wikipedia.org/wiki/Positive_and_negative...

    The positive predictive value (PPV), or precision, is defined as = + = where a "true positive" is the event that the test makes a positive prediction, and the subject has a positive result under the gold standard, and a "false positive" is the event that the test makes a positive prediction, and the subject has a negative result under the gold standard.

  6. Plus and minus signs - Wikipedia

    en.wikipedia.org/wiki/Plus_and_minus_signs

    The plus sign sometimes represents /ɨ/ in the orthography of Huichol. [25] In the algebraic notation used to record games of chess, the plus sign + is used to denote a move that puts the opponent into check, while a double plus ++ is sometimes used to denote double check. Combinations of the plus and minus signs are used to evaluate a move ...

  7. Kehr's sign - Wikipedia

    en.wikipedia.org/wiki/Kehr's_sign

    Kehr's sign is the occurrence of acute pain in the tip of the shoulder due to the presence of blood or other irritants in the peritoneal cavity when a person is lying down and the legs are elevated. Kehr's sign in the left shoulder is considered a classic symptom of a ruptured spleen .

  8. Phrenology - Wikipedia

    en.wikipedia.org/wiki/Phrenology

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  9. Positive semidefinite - Wikipedia

    en.wikipedia.org/wiki/Positive_semidefinite

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