What does 1.004 DOTs indicate in Polkadot

Ecosystem
1

Why does this address receive/send a tons of transactions with amount = 1.004 DOTs?
12k6zoi7L6Jd2oCVek7Zktj8CHY2yoY6nxZThDZK7mdWP6Sr
What does the number (1.004 DOTs) may indicate in Polkadot?