Deploying to the Wolfram Cloud

Questions
1

I have just started to deploy to the cloud.
My first attempt has been

Objetos = {Graph[{1 <-> 2, 2 <-> 3, 3 <-> 1}], MatrixForm[( {
      {1, 2},
      {3, 4}
     } )], "Hello World"};

CloudDeploy[Manipulate[Objetos[[obj]],
{obj, {1, 2, 3}}]]
It worked nicely!. Then I wanted to use mathematica symbols, like this

Objetos = {Graph[{1 <-> 2, 2 <-> 3, 3 <-> 1}], MatrixForm[( {
      {1, 2},
      {3, \[Omega]}
     } )], "Hello World"};
CloudDeploy[Manipulate[Objetos[[obj]],
  {obj, {1, 2, 3}}]]

Everything worked again except that the symbol omega would not display.
Is there a restriction to work with symbols in the cloud??
Thanks for any help you can give me to understand this.
Jesus