Callimas was an individual referenced in the Children of Tama language metaphorical phrase, "Callimas at Bahar".
In 2368, after an outburst at Captain Jean-Luc Picard, Captain Dathon spoke this phrase, implying his intention to make up for his outburst. (TNG: "Darmok")
This character was only mentioned in dialogue.
According to the script, Callimas was pronounced as "kah-lee-MAHS".