The name that is transliterated as «Cos» in English is translated in Libras (Brazilian Sign Language) with a sign that combines the signs for «crab» (the meaning of the name) and «currency» (the local currency that was printed in Cos had an emblem of a crab). (Source: Missão Kophós )
«Cos» in Libras (source )
For more information on translations of proper names with sign language see Sign Language Bible Translations Have Something to Say to Hearing Christians .