As a proper noun cos
is (island).
As a symbol com is
the iso 3166-1 three-letter (alpha-3) code for the comoros.
cos
Translingual
Symbol
(head)
a symbol of the trigonometric function cosine.
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com
English
Abbreviation
(Abbreviation)
(head)
committee
communication
(Internet) commercial as in (the most known Internet TLD).
Derived terms
* intercom
* telecom