May 25 (Reuters) - Its name is redolent of an exotic electrical storm. But is the freshly christened hacking group "Volt Typhoon" an imminent danger to American infrastructure, or just a new crop of digital spies playing an old game? Here is what is known about the group and its potential threat: 'FUTURE CRISES' Nearly every country in the world uses hackers to gather intelligence. Major powers like the United States and Russia have large stables of such groups - many of which have been given colourful nicknames by cybersecurity experts, like "Equation Group" or "Fancy Bear." Where experts worry...