Likely not, but that won't stop them from hassling you about it.

If it looks suspicious, they will be inclined to prevent you from boarding with it, whether they know what it is or not.

I wonder what they think of a 6" long mirror with a plastic handle, that with one brief exertion becomes a glass dagger?

I'd laugh, only I still have to fly home and back for Christmas.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)