Valid characters for app names

Question

Are there any rules that limit what characters may be used for naming apps on the Android and Apple app stores. For instance, is there a constraint that

• restricts the name length. I have come across suggestions that a good name should have 12- characters.
• limits the name to contain only alphanumeric characters
• is it possible to use any unicode character in an app name

Answer 1

For iOS:
App Store displayed name:

• 255 characters limit
• Any character or symbol (at least in the ascii range)

Bundle name (displayed under the app icon):

• Around 12 characters before it gets truncated (might be less/more since the font is not fixed size)
• Any ascii character

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Apple review team may deny the submitted names at their discretion (avoid ascii art ¯\_(ツ)_/¯)