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Spesmilo Sign
The spesmilo is an obsolete decimal international currency, proposed in 1907 by René de Saussure and used before the First World War by a few British and Swiss banks, primarily the Ĉekbanko esperantista. The spesmilo was equivalent to one thousand spesoj, and worth 0.733 grams of gold. The ₷ character is a monogram of a cursive capital “S”, from the tail of which emerges an “m”. - Wikipedia
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Division Sign
An obelus (÷) (plural, obeli) is a symbol consisting of a short horizontal line with a dot above and below. It is mainly used to represent the mathematical operation of division. It is therefore commonly referred to as the division sign. The word “obelus” comes from the Greek word for a sharpened stick, spit, or pointed pillar. This is the same root as that of the word “obelisk”. - Wikipedia
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Symbol For Delete Form Two
From ISO 9995-7, the keyboard symbol for an undoable delete. - Unicode
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Box Drawings Up Single and Horizontal Double
Box drawing characters, also known as line drawing characters, or pseudographics, are widely used in text user interfaces to draw various frames and boxes. In graphical user interfaces these characters are much less useful, because it is much simpler to draw lines and rectangles directly with graphical APIs; besides, box drawing characters work only with fixed-width (monospaced) fonts. They are still useful, however, for plaintext comments on websites. - Wikipedia
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See-No-Evil Monkey
The three wise monkeys embody the proverbial principle to “see no evil, hear no evil, speak no evil”. The three monkeys are Mizaru, covering his eyes, who sees no evil; Kikazaru, covering his ears, who hears no evil; and Iwazaru, covering his mouth, who speaks no evil. - Wikipedia
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Musical Symbol G Clef
When the G-clef is placed on the second line of the staff, it is called the treble clef. This is the most common clef used today, and the only G-clef still in use. For this reason, the terms G-clef and treble clef are often seen as synonymous. It was formerly also known as the violin clef. The treble clef was historically used to mark a treble, or pre-pubescent, voice part. - Wikipedia
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Alchemical Symbol for Tutty
An oxide of zinc which collects on the sides of furnaces where copper or brass was smelted, and zinc sublimed. - Wikipedia
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Benzene Ring
Benzene is a colorless and highly flammable liquid with a sweet smell. Because it is a known carcinogen, its use as an additive in gasoline is now limited, but it is an important industrial solvent and precursor to basic industrial chemicals including drugs, plastics, synthetic rubber, and dyes. In 1865, the German chemist Friedrich August Kekulé suggested that the structure contained a six-membered ring of carbon atoms with alternating single and double bonds. - Wikipedia
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Cylindricity
A three-dimensional geometric tolerance that controls how much a feature can deviate from a perfect cylinder. - Wiktionary
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Earth Ground
Electrical circuits may be connected to ground (earth) for several reasons. In mains powered equipment, exposed metal parts are connected to ground to prevent contact with a dangerous voltage if electrical insulation fails. Connections to ground limit the build-up of static electricity when handling flammable products or when repairing electronic devices. In some telegraph and power transmission circuits, the earth itself can be used as one conductor of the circuit, saving the cost of installing a separate return conductor. - Wikipedia
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