The IEEE Milestone is a designation awarded by the IEEE¹, the world's largest professional association of electrical and electronic engineers, to honor historical technical achievements from among innovations in the fields of electricity, electronics, information, and communications that have contributed substantially to the advancement of industry and society. The IEEE Milestone is awarded only after at least 25 years have passed since development. Established in 1983, the IEEE Milestone has so far honored around 120 technical achievements² worldwide, including the Voltaic Cell and the Fleming Valve.

1 IEEE (pronounced "eye-triple-E"): Headquartered in the U.S.A., the Institute of Electrical and Electronics Engineers is the world's largest professional association of electrical, electronic, information, and communication engineers, with more than 400,000 members in 160 countries worldwide.
2 118 technical achievements as of December 31, 2011