Math & Science ⇒ Two symbols together

[Borneq]

Is possible create my own symbol from two symbols? I want draw one symbol, move left and draw second on the same place.

[Stefan Kottwitz]

Sure, for example using \rlap or \llap to set a symbol without a width. Define a macro for it:

\newcommand*{\sym}{\rlap{O}+}

Then just write \sym in the text.