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By the mid 1960s, typewriter accessories such as the "Doublebold" could automatically double-strike every character while engaged. [7] While this method makes a character bolder, and can effectively emphasize words or passages, in isolation a double-struck character is not always clearly different from its single-struck counterpart. [8] [9]
All these letter shapes may be manipulated with MathML's attribute mathvariant. Double-struck C, N, Q, R and Z are handwritten forms of the corresponding bold letters. They are not intended for print publication, and the rest of the series has no purpose. The four sans-serif series also have no purpose in mathematics. [citation needed]
Double-struck capital gamma: 213E ℿ: Double-struck capital pi 213F ⅀: Double-struck n-ary summation: 2140 ⅁ Turned sans-serif capital G 2141 ⅂ Turned sans-serif capital L 2142 ⅃ Reversed sans-serif capital L 2143 ⅄ Turned sans-serif capital Y 2144 ⅅ: Double-struck italic capital D 2145 ⅆ: Double-struck italic small D 2146 ⅇ ...
Many are hard-coded formatting variants. For example, the Q series starts out with full-width q, bold 𝐪, italic 𝑞, bold italic 𝒒, script 𝓆, bold script 𝓺, Fraktur 𝔮, double-struck 𝕢, bold Fraktur 𝖖, sans-serif 𝗊, bold sans-serif 𝗾, italic sans-serif 𝘲, bold italic sans-serif 𝙦, monospace 𝚚.
The Bayer designation naming scheme for stars typically uses the first Greek letter, α, for the brightest star in each constellation, and runs through the alphabet before switching to Latin letters. In mathematical finance , the Greeks are the variables denoted by Greek letters used to describe the risk of certain investments.
Many letters of the Latin alphabet, both capital and small, are used in mathematics, science, and engineering to denote by convention specific or abstracted constants, variables of a certain type, units, multipliers, or physical entities. Certain letters, when combined with special formatting, take on special meaning.
Double Denomination 1976 Bicentennial Quarter Struck on a Dime: sold for $9,200 in 2020. 1976-D Clad DDO Bicentennial Quarter Business Strike: sold for $8,400 in 2023.
In Japan, double strikethrough is conventionally used (rather than single strikethrough) when striking out text. This is for added clarity, as in complex kanji a single strikethrough may be missed or confused with a stroke in the character. Double, triple or multiple strikethrough may also (especially formerly) be used as a way of emphasising ...