Excuse me. In fact, this phrase can not be said to be completely compatible with the meaning of "please ask", but, obviously, you asked "please ask" is put in front of the question to be asked or the words to be said, and has the function of introducing, so it is also within the scope of the meaning of "excuse me".

The question can be followed directly, such as:

Excuse me,what does the logo mean ?

Or you can add a euphemism, such as:

Excuse me,may I ask what the logo means ?

Excuse me,may I ask what the logo means ?