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 what is SIGMOID NOTCH?

A concavity on the superior surface of the mandibular ramus between the coronoid and condyloid processes.

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a curved depression on the upper border of the lower jaw between the coronoid process and the condyloid process—called also sigmoid notch

or

the deep depression in the proximal end of the ulna by which the ulna articulates with the trochlea of the humerus at the elbow—called also semilunar notch, sigmoid notch

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Sigmoid notch is a large depression in the upper extremity of the ulna that fits the trochlea of the humerus (the bone directly above the ulna in the arm) as part of the elbow joint. It is formed by the olecranon and the coronoid process.

Hence sigmoid notch of the olecranon process is found in radius-ulna.
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