You know what it looks like… but what is it called?
TAKE THE QUIZ“clausum”
The following 2 entries include the term clausum.
mare clausum
noun: a navigable body of water (such as a sea) that is under the jurisdiction of one nation and is closed to other nations
quare clausum fregit
noun: a writ for land trespass
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Merriam-Webster unabridged