Omega Herculis (ω Her, ω Herculis) is a star in the constellation Hercules. It has the traditional name Kajam ("club") (also written as Cajam, Cujam).
In Chinese, 斗 (Dǒu), meaning Dipper for Liquid, refers to an asterism consisting of ω Herculis, 49 Serpentis, 13 Herculis, 29 Herculis and 33 Herculis. Consequently, ω Herculis itself is known as 斗一 (Dǒu yī, English: the First Star of Dipper for Liquid.)
Omega Herculis was a latter designation of 51 Serpentis.
Read more about Omega Herculis: Structure