Vajrapāṇi

One of the eight great Bodhisattvas, especially associated with the transmission of tantric teachings. His name derives from the thunderbolt (vajra) which he holds in his hand (pāṇi) as his emblem. Iconographically, he is encountered in a yellow peaceful form or a dark blue wrathful forms.

A Dictionary of Buddhism, Oxford University Press, 2003, 2004 (which is available in electronic version from answer.com)

【梵】vajrapāṇiḥ
【梵】वज्रपाणिः【中】金剛手
【藏】phyag na rdo rje. lag na rdo rje

Mahāvyutpatti - DDBC version