It's just the year it came out.

1973 is the year Pink Floyd released The Dark Side of the Moon. Nothing deeper.

People sometimes treat it like a code or a secret message. It’s not. The album dropped in 1973 – March 1 in the UK, a few weeks later in the US. That’s the whole significance.

If you’re looking for hidden meaning in a number, you might be overthinking it. The triangle on the cover didn’t need a reason either.