What is the 1.25 M band range?

Excuse me, could you clarify what the 1.25 M band range refers to? Is it a specific frequency range in telecommunications, perhaps related to radio waves or microwaves? Or is it a term used in a different context altogether? I'm quite curious to understand the significance and potential applications of this range, especially in relation to cryptography, finance, or any other area that might intersect with my expertise in cryptocurrency and finance.