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& is a named or entity character reference and & is a numerical character reference. In fact, & is actually just a substitution for & (see list of character entities ):
These codes allow fractions to be represented with typographically smaller numerators and denominators, but they can be replaced by other ways of typing a fraction (e.g. "1/2"). CSS Styling can also be used to achieve the same effect as described on Got Unicode and Lars Bruzelius.
Superscript Two Unicode Code Point, ² Unicode, Decimal NCRs, Hexadecimal NCRs, UTF8 Code, Escaped Unicode
Twitter auto-converts encoded ampersands… Some extra notes: If you want to use an ampersand as a value inside the query string of a url (and not as a delimiter for separating arguments), then you should use the URL-encoded value: %26
Alt Codes for Math Bold Decimal Digits (𝟏 𝟐 𝟑) ALT Codes. Alt Codes for Mathematical Fraktur Letters (𝔄 𝔅 ℭ) ALT Codes. Alt Codes for Regional Indicator Letters (🇦 🇧 🇨) ALT Codes. Alt Codes for CJK Circled Katakana Symbols (㋐ ㋚ ㋠). ... ² ² U+00B2:
An HTML entity is a string that begins with an ampersand (&) and ends with a semicolon (;). HTML entities are used to display reserved characters (HTML code) and invisible characters (non-breaking space). These are generally characters not found on keyboards.
W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more.
A list of HTML Character entities and PostScript glyphs
& is "valid", though whether you want to use it is another question. If you're writing a document in XML, then & will be used to represent an ampersand. If your XML document is describing content that itself is encoded in a similar way -- e.g. HTML -- then that content could logically include an & itself. This could lead to a & in the XML.
This is an online scientific calculator with double-digit precision that supports both button click and keyboard type.