The first-ever electronic message said what?

Five decades ago, a small group of computer scientists working out of a modest space in UCLA’s Boelter Hall accomplished something never before seen. They successfully created the world’s first network connection on October 29, 1969, as part of what was known as ARPANET, and thus became the first node of what would eventually become the Internet. The team, led by the distinguished professor of computer science, Leonard Kleinrock, on that day successfully transmitted the first message over the ARPANET from UCLA all the way to the Stanford Research Institute hundreds of miles north. According to Kleinrock, they intended to transmit the word “LOGIN,” but the system crashed just after they had sent the first two letters. “Hence, the first message on the Internet was 'LO' — as in 'Lo and behold!',” Kleinrock said.

Source: UCLA