Emacs: Seeing Unicode of a char:
Place cursor over character, then type   C-u C-x = .


Typing Unicode in an Emacs buffer:
Caduceus:

  Decimal:
(setq read-quoted-char-radix 10)
C-q  2 9 9 4 2 8   RET


  Alternatively, octal:
(setq read-quoted-char-radix 8)
C-q  1 1 1 0 6 4 4   RET


  Alternatively, hexidecimal:
(setq read-quoted-char-radix 16)
C-q  4 9 1 a 4   RET

Rod of Asclepius:

  Decimal:
(setq read-quoted-char-radix 10)
C-q  2 9 9 5 7 3   RET


  Alternatively, octal:
(setq read-quoted-char-radix 8)
C-q  1 1 1 1 0 6 5   RET


  Alternatively, hexidecimal:
(setq read-quoted-char-radix 16)
C-q  4 9 2 3 5   RET



Font shapes

Cursive-like
Herculanum Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Marker Felt Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Chalkduster Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
PilGi Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Brush Script MT Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Comic Sans MS Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Apple Chancery Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
cursive Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Papyrus Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
fantasy Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Zapfino Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Serif-ed
Avant Garde Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Bookman Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Georgia Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
San-serif—ish
Krungthep Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Impact Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Gill Sans Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Arial Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Arial Black Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Helvetica Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Verdana Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Monospace (some are Typewriter)
monospace Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Courier New Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Courier Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Monaco Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Menlo Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.
Andale Mono Here is a Test of many fully Featured items, 0,1,2,3,4,5,6,7,8,9.

Some & entities: amp and friends

ldquo Left/Right Double-quotation-mark, … ” rdquo …but use Q and Q instead. (The achiral double-quote is quot. E.g 4inches in The pencil is 4" long.) † ‡ dagger Dagger Dagger, Double-dagger • bull Bullet – ndash en-dash — mdash em-dash … ⋮ hellip vellip Horizontal/vertical ellipsis ′ ″ prime Prime Prime, Double-prime
≡ ≢ Congruent-to mod … and negation thereof. forall “For all”, e.g ∀ x >3 …. ∃ exists “There exists”, e.g ∃ x >3 st.…. ∵ #8757 “Because ”. ∴ #8756 there4 “Therefore ”. ⁂ #8258 Asterism, three asterisks triangularly-placed. This is an emphasis marker, like the • symbol. × times Times. ⟨ ⟩ lang rang Left/right angle-bracket (“bra/ket”, for physicists). ∞ infin Infinity ⊥ perp Perpendicular-to ≈ #x2248 Almost-equal-to. approx also works, but does not validate. ƒ fnof Function-of symbol, e.g Our ƒ(x) equals…. ℑ ℜ image real Imaginary-part Real-part ℘ weierp Weierstrass p-function (Weierstrass in Symbol font)alefsym Aleph (from Hebrew, used for cardinals in mathematics)#8470 Ordinal-number prefix. See № 5, vol. 2. Δ δ Delta delta → ← rarr larr Right/Left-arrow ↔ harr Left-right arrow ↑ ↓ uarr darr Up/Down-arrow ⇐ ⇒ lArr rArr Left/Right double-arrow (Is implied by/Implies)hArr Left-right double-arrow (IFF) ⇑ ⇓ uArr dArr Upwards/Downwards double-arrow ↵ crarr Carriage-return arrow
/ ⁄ Slash and frasl , fraCTION slASH. Make any fraction, e.g 9147 with 91frasl47. Some fractions have an entity, e.g frac78 for ⅞. However, only these ½ ¼ ¾ validate. These others have a UTF-character and a Unicode (see source) ⅓ ⅓ ⅔ ⅔ ⅕ ⅕ ⅖ ⅖ ⅗ ⅗ ⅘ ⅘ ⅙ ⅙ ⅚ ⅚ ⅛ ⅛ ⅜ ⅜ ⅝ ⅝ ⅞ ⅞
¤ curren Currency sign € euro Euro sign ¢ cent Cent sign £ pound Pound sign ₤ #8356 Lira sign ¥ yen Yen sign
[These next two are from Jukka Korpela's dashes.html.]#12316 wave dash (a Chinese/Japanese/Korean character)#12336 wavy dash (ditto above)#xFFFD The “replacement character” usually indicates an unrecognized character. (If you see that on my page then possibly your browser is mis-decoding, but more likely I have made a mistake.)

Displaying   fnof   #402   #131  gives ƒ ƒ (The #131 is visually the same glyph. However, I've removed it here, because its presence generated a warning under HTML validation.)
Apparently the first two are synonyms, but #131 is somehow different. In the browsers I've tried, they look the same.

An extensive list of character references is online. And shapecatcher tries to recognize mouse-drawn Unicode chars.

Here are several ways to put LEFT-DOUBLE QUOTE into an HTML file. The (hexi)decimal references allow a variable number of ‘digits’.

An alternative way to put a character into a webpage, is to use CSS to give a content property to some tag. (This is sometimes called generated content.) Unfortunately, the Find cmd in the browsers I've tested do not find the generated content.

Non-printing entities: nbsp and pals

Look at spacing and at line-breaks when the window is resized.

Here is emsp

mmm m m m m
mm m m m m 
mmm m m m m
mm m m m m 

And ensp

mmm m m m m
mm m m m m 
nnn n n n n
nn n n n n 

Also nbsp

mmm m m m m
mm m m m m 
mmm m m m m
mm m m m m 


m

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