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GOD FUCKING DAMNIT! HOW HARD IS IT TO READ A FUCKING TOPIC? JESUS CRIST! What is so hard about understanding what "Closed" means? Here, have the definition.
–adjective
1.
having or forming a boundary or barrier: He was blocked by a closed door. The house had a closed porch.
2.
brought to a close; concluded: It was a closed incident with no repercussions.
3.
not public; restricted; exclusive: a closed meeting; a closed bid at a private auction.
4.
not open to new ideas or arguments.
5.
self-contained; independent or self-sufficient: a closed, symbiotic relationship.
6.
Phonetics . (of a syllable) ending with a consonant or a consonant cluster, as has, hasp. Compare open ( def. 35b ) .
7.
Linguistics . (of a class of items) limited in membership and not readily expanded to include new items, as the class of inflectional affixes, articles, pronouns, or auxiliaries ( opposed to open).
8.
Hunting, Angling . restricted as to the kind of game that may be legally taken and as to where or when it may be taken: woods closed to deer hunters.
9.
Mathematics .
a.
(of a set in which a combining operation between members of the set is defined) such that performing the operation between members of the set produces a member of the set, as multiplication in the set of integers.
b.
(of an interval) containing both of its endpoints.
c.
(of a map from one topological space to another) having the property that the image of a closed set is a closed set.
d.
(of a curve) not having endpoints; enclosing an area.
e.
(of a surface) enclosing a volume.
f.
(of a function or operator) having as its graph a closed set.