฿ • ₵ • ¢ • $ • ₡ • ₫ • € • ƒ • ₲ • ₭ £ • ₤ • Lm • ₥ • ₦ • ₱ • P • R • руб • ₨ ৲ • S/. • ৳ • R$ • $ • ₮ • ₩ • ¥ • zł • ₴ • ₪
Former signs ₳ • ₢ • ₰ • ₯ • ₠ • ₣ • ℳ • ₧ • I/.
Punctuation
apostrophe ( ' ' ) brackets ( ), [ ], { }, < > colon ( : ) comma ( , ) dashes ( ‒, –, —, ― ) ellipsis ( …, ... ) exclamation mark ( ! ) full stop/period ( . ) guillemets ( « » ) hyphen ( -, ‐ ) question mark ( ? ) quotation marks ( ' ', " " ) semicolon ( ; ) slash/stroke ( / ) solidus ( ∕ ) spaces ( ) ( ) ( ) interpunct ( · ) ampersand ( & ) asterisk ( * ) at ( @ ) backslash ( ) bullet ( • ) caret ( ^ ) currency ( ¤ ) ¢, $, €, £, ¥, ₩, ₪ dagger/obelisk ( † ) ( ‡ ) degree ( ° ) dele ( ) emoticons (☻ ) inverted exclamation point ( ¡ ) inverted question mark ( ¿ ) number sign ( # ) numero sign ( № ) percent and related signs ( %, ‰, ‱ ) pilcrow ( ¶ ) prime ( ′ ) section sign ( § ) tilde/swung dash ( ~ ) umlaut/diaeresis ( ¨ ) underscore/understrike ( _ ) vertical/pipe/broken bar ( |, ¦ ) asterism ( ⁂ ) index/fist ( ☞ ) therefore sign ( ∴ ) lozenge ( ◊ ) interrobang ( ‽ ) irony mark ( ؟ ) reference mark ( ※ ) sarcasm mark ( ) The dollar sign or peso sign ($) is a symbol primarily used to indicate a unit of currency.

From the Spanish Coat of Arms engraved on the Spanish 'Real'
There are a number of alternative origin theories, widely regarded as false, sometimes bordering on the occult.

Alternative origin hypothesis
That $ is a monogram of U and S, which was used as a mark on money bags issued by the United States Mint. The letters U and S superimposed resemble the historical double stroke "$" sign: the bottom of the 'U' disappears into the bottom curve of the 'S', leaving two vertical lines. This double stroke dollar sign has been used to refer to US Currency. Thus, the one stroke design may have been modified to the double stroke design to represent United States currency. This theory was largely popularized by the novel Atlas Shrugged by philosopher Ayn Rand.

From 'US'
That the dollar sign harks back to the most important Roman coin, the Sestertius, which had the letters 'HS' as its currency sign. When superimposed, these letters form a dollar sign with two vertical strokes (the horizontal line of the 'H' merging into the 'S'). This theory is widely discarded, in spite of the tendency of neo-classic Roman Republic influences in styles evident in other early US government designs, such as the Capitol and Senate buidings.

From a symbol used on the Roman sestertius
That the two vertical lines represent the two cult pillars Boaz and Jachin in the original Temple of Solomon at Jerusalem. This is based on the theory that Masonic symbols, such as the All Seeing Eye of God, appear on U.S. currency, which they did not in 1785.

The two pillars in the temple of Solomon
That it derives from the symbol used on a German Thaler. According to Ovason (2004), on one type of thaler, one side showed the crucified Christ, and the other side showed a serpent hanging from a cross, and near the serpent's head the letters NU, and on the other side of the cross the number 21. This refers to the Bible, Numbers, chapter 21.

From a sign used on the German Thaler
The dollar symbol was in use in colonial times before the American Revolution. Prices were often quoted in units of silver, as the Spanish "piece of eight" was in common use for payment of goods and services. When a price was quoted the capital 'S' was used to indicate silver with a capital 'U' written on top to indicate units. Eventually, the capital 'U' was replaced by double vertical hash marks.

Unit of Silver
Another possibility is that it derives from the British notation 8/ for eight shilling, referring to the Spanish 8 reales coin ("piece of eight"), which later became the USA dollar. Others derive it from the Portuguese Cifrão sign .
A common explanation is that the symbol is derived from the numeral eight with a slash through it denoting "pieces of eight." The Oxford English Dictionary prior to 1963 held that this was the most probable explanation, though later editions have placed this theory in doubt.
Still another explanation holds that the dollar sign is derived from (or at least inspired by) the mint mark on Spanish colonial silver coins ("real" or "piece of eight") that were minted in Potosí (in present day Bolivia). The mint mark was composed of the letters "PTSI" superimposed on one another, and bears an undeniable resemblance to the single-stroke dollar sign (see picture). The Potosí mine is generally accepted as having been the largest single silver strike in history. Silver coins minted in Potosí would have been in common use in colonial America, and its mint mark widely recognized.

Other theories
According to a plaque in the burgh of St Andrews in Scotland, UK, the first dollar symbol was cast in a type-foundry in Philadelphia in 1797 that belonged to Scottish immigrant John Baine. John Baine had lodged in a house in South Street in St Andrews with Alexander Wilson, the father of Scottish type-founding.
First cast dollar symbol
As the dollar sign is one of the few symbols that is on the one hand almost universally present in computer character sets, but on the other hand rarely needed in its literal meaning within programming languages, the $ character has been used on computers for many purposes not related to money, including:

$ was used as a string terminator in CP/M and subsequently also in all versions of 86-DOS, PC-DOS, MS-DOS and derivatives (Int 21 with AH=09h)
$ signifies the end of a line or the file in text editors ed, ex, vi and derivatives, and consequently:
$ matches the end of a line or string in sed, grep, and POSIX and Perl regular expressions.
$ was used to define string variables in older versions of the BASIC programming language ("$" was often pronounced "string" instead of "dollar" in this use).
$ is used to define hexadecimal constants in Pascal-like languages as Delphi.
$ is used to define variables in the PHP programming language and scalar variables in the Perl programming language (see Sigil (computer programming)).
In most shell scripting languages, $ is used to interpolate environment variables, special variables, arithmetic computations and special characters, and to perform translation of localised strings.
In UNIX-like systems the $ is often part of the command prompt, depending on the user's shell and environment settings. For example, the default environment settings for the bash shell specify $ as part of the command prompt.
$ is used in the TeX typesetting language to delimit mathematical regions.
$ is used by prompt command in DOS to insert special sequences into the DOS command prompt string.
Formulas in MS Excel and other spreadsheets use $ to indicate an absolute cell reference. Currencies that use the dollar or peso sign

Dollar
Canadian dollar
Euro sign
Pound sign
Spanish dollar (Pieces of Eight)
Cifrão
$ (film)
Sigil (computer programming)