more encoding woe

After the thread the other day about encoding, I think this is slightly
off-topic but hopefully someone can help me.

I need the symbols for the following character entities to appear in my
output - Ive looked up their encoding (ISO 9573-13) and used that (in
<meta>), but all I get is the usual box... I know David Carlisle knows
his mathML so hopefully he will have come across these before :) 

<root>
  <node>aleph - &#8501;</node>
  <node>angle-spherical - &#8738;</node>
  <node>Bernoulli function - &#8492;</node>
  <node>composite function - &#8728;</node>
  <node>congruent with - &#8773;</node>
  <node>four dots above - &#8412;</node>
  <node>Hamiltonian - &#8459;</node>
  <node>iff - &#58213;</node>
  <node>Lagrangian - &#8466;</node>
  <node>is implied by - &#8656;</node>
  <node>low asterisk - &#8727; </node>
  <node>minus-or-plus - &#8723;</node>
  <node>negated set - &#8713;</node>
  <node>order of - &#8500;</node>
  <node>physics M-matrix - &#8499;</node>
  <node>similar, equals - &#8771;</node>
  <node>three dots above - &#8411;</node>
  <node>top - &#8868;</node>
  <node>triple prime - &#8244;</node>
  <node>corresponds to - &#8793;</node>
</root>


cheers
andrew

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