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The nabla is a triangular symbol resembling an inverted Greek delta: [1] or ∇. The name comes, by reason of the symbol's shape, from the Hellenistic Greek word νάβλα for a Phoenician harp, [2] [3] and was suggested by the encyclopedist William Robertson Smith in an 1870 letter to Peter Guthrie Tait.
3. Length of a line segment: If P and Q are two points in a Euclidean space, then | | often denotes the length of the line segment that they define, which is the distance from P to Q, and is often denoted (,). 4. For a similar-looking operator, see |. | : |
white down-pointing triangle (nabla operator) ... white square with vertical bisecting line:
An inverted triangle colored pink would symbolize gay male victims. A non-inverted (base down, point up) triangle and/or a yellow triangle is generally more evocative of the Jewish victims. Some examples of camp triangle emblems on monuments and related uses
Musical symbols are marks and symbols in musical notation that indicate various aspects of how a piece of music is to be performed. There are symbols to communicate information about many musical elements, including pitch, duration, dynamics, or articulation of musical notes; tempo, metre, form (e.g., whether sections are repeated), and details about specific playing techniques (e.g., which ...
An intriguing catchphrase typography upside down invites the reader to rotate the magazine, in which the first names "Michael" or "Peter" are transformed into "Nathalie" or "Alice". [107] [108] In 2015 iSmart's logo on one of its travel chargers went viral because the brand's name turned out to be a natural ambigram that read "+Jews!" upside down.
The same fractal can be achieved by dividing a triangle into a tessellation of similar triangles and removing the triangles that are upside-down from the original, then iterating this step with each smaller triangle.
In geometry, the inverse Pythagorean theorem (also known as the reciprocal Pythagorean theorem [1] or the upside down Pythagorean theorem [2]) is as follows: [3] Let A, B be the endpoints of the hypotenuse of a right triangle ABC. Let D be the foot of a perpendicular dropped from C, the vertex of the right angle, to the hypotenuse. Then