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Arrow pushing. Arrow pushing or electron pushing is a technique used to describe the progression of organic chemistry reaction mechanisms. [ 1] It was first developed by Sir Robert Robinson. In using arrow pushing, "curved arrows" or "curly arrows" are drawn on the structural formulae of reactants in a chemical equation to show the reaction ...
The universal recycling symbol ( U+2672 ♲ UNIVERSAL RECYCLING SYMBOL or U+267B ♻ BLACK UNIVERSAL RECYCLING SYMBOL in Unicode) is a symbol consisting of three chasing arrows folded in a Möbius strip. It is an internationally recognized symbol for recycling. The symbol originated on the first Earth Day in 1970, created by Gary Anderson, then ...
File:Eo circle red arrow-down.svg. Size of this PNG preview of this SVG file: 512 × 512 pixels. Other resolutions: 240 × 240 pixels | 480 × 480 pixels | 768 × 768 pixels | 1,024 × 1,024 pixels | 2,048 × 2,048 pixels. This is a file from the Wikimedia Commons. Information from its description page there is shown below.
Communist symbolism represents a variety of themes, including revolution, the proletariat, the peasantry, agriculture, or international solidarity. The red flag, the hammer and sickle and the red star or variations thereof are some of the symbols adopted by communist movements, governments, and parties worldwide.
The Hollow-Face illusion is an optical illusion in which the perception of a concave mask of a face appears as a normal convex face. Hybrid image. A Hybrid image is an optical illusion developed at MIT in which an image can be interpreted in one of two different ways depending on viewing distance. Illusory contours.
Line moiré is one type of moiré pattern; a pattern that appears when superposing two transparent layers containing correlated opaque patterns. Line moiré is the case when the superposed patterns comprise straight or curved lines. When moving the layer patterns, the moiré patterns transform or move at a faster speed.
File:Down arrow red.svg. Size of this PNG preview of this SVG file: 200 × 200 pixels. Other resolutions: 240 × 240 pixels | 480 × 480 pixels | 768 × 768 pixels | 1,024 × 1,024 pixels | 2,048 × 2,048 pixels. Original file (SVG file, nominally 200 × 200 pixels, file size: 817 bytes) This is a file from the Wikimedia Commons.
File:Red Arrow Down.svg. Size of this PNG preview of this SVG file: 600 × 600 pixels. Other resolutions: 240 × 240 pixels | 480 × 480 pixels | 768 × 768 pixels | 1,024 × 1,024 pixels | 2,048 × 2,048 pixels | 700 × 700 pixels. Original file (SVG file, nominally 700 × 700 pixels, file size: 686 bytes) This is a file from the Wikimedia ...
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