Unicode Symbols

My browser can display many more symbols than I know how to input with my keyboard: eg — that one has a name, "em dash", and an html name, "—" as well as a unicode: U+2014 (hex = 8212 decimal).  Here are some more:

• Unicode Page — Mathematical Operators (2200-22ff)

  Symbol	Name (Entity)	Unicode (hex)	Unicode (decimal)
  ∀	∀	2200	8704
  ∃	∃	2203	8707
  ∆	∆	2206	8710
  ∂	∂	2202	8706
  ∑	∑	2211	8721
  ∏	∏	220f	8719
  √	√	221a	8730
  ∛	∛	221b	8731
  ∞	∞	221e	8734
  ∫	∫	222b	8747
  ∤	∤	2224	8740
  ∪	∪	222a	8746
  ∩	∩	2229	8745
  ∈	∈	2208	8712
  ∴	∴	2234	8756
  ≈	≈	2248	8776

• Unicode Page — Miscellaneous Technical ( xxxx-xxxx )

  Symbol	Name (Entity)	Unicode (hex)	Unicode (decimal)
  ⌈	⌈	2308	8968
  ⌉	⌉	2309	8969
  ⌊	⌊	230a	8970
  ⌋	⌋	230b	8971
  ⎛	⎛	239b
  ⎜	&239c;	239c
  ⎝	&239d;	239d
  ⎞	⎞	239e
  ⎟	⎟	239f
  ⎠	⎠	23a0
  ⎧	⎧	23a7
  ⎩	⎩	23a9
  ⎪	⎪	23aa
  ⎫	&i#x23ab;	23ab
  ⎭	⎭	23ad
  ⍵	⍵	2375

Glyphics