Convey the meaning of "any" without using words

There is a design with several drop downs to select between multiple choices.

These choices work as filters on a large dataset. When you select one of them, only the records matching the selection will be displayed.

The first choice is always "all", meaning that you don't care about that particular category.

The problem is that when translated, for languages that have gender, the translation is different depending on the gender of the category, and it's difficult for the translation engine to provide an accurate translation.

So, we want to convey this meaning using a language independent symbology. Right now we have a combination of lines and a star:

But I am not sure this design is the best one to convey the meaning.

What are some symbols that could be used for this purpose? (Any Unicode symbol can be used.)