Wikipedia:Manual of Style/Character Table 2

Potentially confusing or technically problematic characters |
Category	coded form (direct form)	Notes
Miscellany	&amp; (&) &lt; (<) &gt; (>) &#91; ([) &#93; (]) &apos; (') &#124; (|)	Use these characters directly in general, unless they interfere with HTML or wiki markup. Apostrophes and pipe symbols can alternatively be coded with {{'}} and {{!}} or {{pipe}}. See also character-substitution templates and WP:ENCODE.
Greek letters	&Alpha; (Α) &Beta; (Β) &Epsilon; (Ε) &Zeta; (Ζ) &Eta; (Η) &Iota; (Ι) &Kappa; (Κ) &Mu; (Μ) &Nu; (Ν) &Omicron; (Ο) &Rho; (Ρ) &Tau; (Τ) &Upsilon; (Υ) &Chi; (Χ) &kappa; (κ) &omicron; (ο) &rho; (ρ)	In isolation, use coded forms to avoid confusion with similar-looking Latin letters; in a Greek word or text, use the direct characters.
Quotes	&lsquo; (‘) &rsquo; (’) &sbquo; (‚) &ldquo; (“) &rdquo; (”) &bdquo; („) &acute; (´) &prime; (′) &Prime; (″) &#96; (`)	Can be confused with straight quotes (" and '), commas, and with one another. MOS:STRAIGHT generally requires conversion to straight quotes, except when discussing the characters themselves or sometimes with non-English languages. See next row for prime characters.
Apostrophe-like	' ` ′ ´ ʻ ʼ ʽ ʾ ʼ ʽ ʻ ʼ	Use {{prime}} and {{pprime}} for ′ and ″ in math, especially arcminutes and arcseconds - see MOS:UNITS Use {{coord}} for full latitude and longitude Per MOS:UNITS, do not use apostrophe-like nor quote-like characters for feet and inches; {{convert}} is usually the best solution. Chinese languages: Use {{wg-apos}} in Wade-Giles transliterations of Chinese, but straight apostrophe for Pinyin Use {{r-apos}}, the "right apostrophe" for Mathews transliterations of Chinese according to Wade-Giles Article titles may need to be changed to be consistent with the templates (but templates should not be used in article titles; see also Wikipedia:Naming conventions (Chinese)) ´ - Use {{keraia}} for native Greek numerals Glottal stop in Polynesian languages should use template or non-ASCII Unicode character per MOS:APOSTROPHE (partial chart on ʻokina): ʻ - Use {{okina}} for Hawaiian, Marquesan, Samoan, Cook Islands Māori, and other Polynesian languages by default ʻ - Use {{fakau'a}} for fakauʻa, to use the correct character per Tongan language § Alphabet (has its own template because it is subject to change) ʼ - Use {{'eta}} for the Tahitian language, which is visually distinct from the ʻokina ʻ - Use {{fakamoga}} for the Wallisian language and the Futunan language Arabic: ʽ - Use {{ayin}} for transliterated Arabic ayin per MOS:APOSTROPHE ʾ - Use {{rhr}} for transliterated Arabic aleph per MOS:APOSTROPHE ʼ - Use {{hamza}} for transliterated Arabic hamza per MOS:APOSTROPHE Romanization of Japanese - use ASCII apostrophe per general convention Romanization of Hebrew - use ASCII apostrophe per Wikipedia:Naming conventions (Hebrew) Romanization of Korean - use ASCII apostrophe per general convention Turkish language - use ASCII, it's a true apostrophe Gwichʼin language - use U+02BC ʼ MODIFIER LETTER APOSTROPHE (maybe make a template for this?) (more notes to be added as more languages are clarified)
Dashes, minuses, hyphens	&ndash; (–) &mdash; (—) &minus; (−) - (hyphen) &shy; (soft hyphen)	Can be confused with one another. For dashes and minuses, both forms are used (as well as {{endash}} and {{emdash}}). Soft hyphens should always be coded with the HTML entity or template. Plain hyphens are usually direct, though at times {{hyphen}} may be preferable (e.g. Help:CS1#Pages). See MOS:DASH, MOS:SHY, and MOS:MINUS for guidelines.
Whitespace	&nbsp; &emsp; &ensp; &thinsp; &hairsp; &zwj; &zwnj;	In direct form these are nearly impossible to distinguish from a normal space. See also MOS:NBSP.
Non-printing	&lrm; &rlm;	In direct form these are nearly impossible to identify. See MOS:RTL.
Mathematics-related	&and; (∧) &or; (∨) &lang; (⟨) &rang; (⟩)	Can be confused with x ^ v < >. In some cases TeX markup is preferred to Unicode characters; see MOS:FORMULA. Use {{angbr}} instead of ⟨) / (⟩)
Dots	&sdot; (⋅) &middot; (·) &bull; (•)	Can be confused with one another. Interpuncts (&middot;) are common in horizontal lists and to indicate syllables in words. Multiplication dots (&sdot;) are used for math. In practice, the dots are used directly instead of the HTML entities.