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What does COI stand for?

COI stands for Cloak of Invisibility (science fiction)

This definition appears very frequently and is found in the following Acronym Finder categories:

  • Slang/chat, popular culture

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Other Resources:
We have 147 other meanings of COI in our Acronym Attic

Samples in periodicals archive:

Neptune moves direct on the 11th, removing his cloak of invisibility to show higher truths to those with eyes to see and hearts to believe.
The assessment, routinely shared with Leonhardt, indicated that the reviewer had been to two meetings in the previous months "in which John Pendry discussed his group's efforts on the same issue, calling it a cloaking device or their Hogwarts project in reference to the cloak of invisibility associated with the Harry Potter series.
The anonymity of the Internet can be like a cloak of invisibility, under which you can conceal some personal details about yourself while freely disclosing others.
Nanomaterials that could make ordinary objects vanish from sight have been unveiled for the first time, but don't order your cloak of invisibility just yet.