Delimiters

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\{A\} + \lfloor B \rfloor +  \lceil C \rceil
      + [D] + (E) + \langle F \rangle + |G| = \| H \|

  \left ( \frac{x+y}{y+z} \right )^{10}
=
  \left \| U^{x^y}        \right \|

More information on these commands may be found in Mathematical Expressions: Delimiters of the WebTeX documentation.