What is the mean of ishika?

The word "ishika" doesn't have a numerical value, so it doesn't have a mean in the mathematical sense. It's likely a name or a word from a different language.

Could you please provide more context?

For example:

* Is it a name? If so, I can tell you what the name "Ishika" means.

* Is it a word from a specific language? If so, I can try to translate it.

Please give me more information so I can help you!