Is there any limitation to the amount of symbols of coins? E.G. most of them have 3 but some of them 4. Can there be 5 and 6?

Does it depend if they are ERC20 or something else?

I own many altcoins - IOTA, NEO, ada, xlm, xmr, trx, gto, xem, sc, fct, ... and I struggle to find a good wallet where to keep them. I don't want to install 1 wallet for each coin that would be crazy. I heard jaxx wallet is not that good so looking for alternatives. Coinoim and other wallets I know of don't support most of these coins. And keeping it at an exchange is not the greatest idea... thanks