pull down to refresh

The first one, it's the closest to sat symbol @rkfg mentioned.
Reminiscent of the Japanese aesthetic, the closest character being 丰 meaning: "Bountiful - abundant, lush, bountiful, plenty, luxurious growth of grass" which suggests a vast amount of Satoshi are still left to mine. This symbol has been adopted by multiple Bitcoin services including satoshilabs.com (Trezor), SatoshiCap.net, pricedinbitcoin21.com, Thunderhub.io, bitcoinicons.com, thebitcoinmachines.com, and many more.
The second symbol looks like bricks - (BRICS nations) that might possibly come up with their own CBDC.
The rest are just lines. If we're going this far, I would rather prefer something like this: シ