User blog comment:Eners49/The secret 0th hyper-operator?/@comment-2601:142:2:EC49:A496:CA1D:3DA2:B5DD-20180728144329/@comment-162.238.217.96-20180728204815

How about ? Extensible-E with 10^x being replaced with 10?x

For example E100#100 E100##100 E100#^#100 E100#^^#100 E100#{#}100 E100#{#,#,#}100 E100#{#,#,1,2}100 E100#{#,#+1,1,2}100