How to make Custom Text characters?

[Exo Pheratype]

Ive seen the airboat, and I saw ther Half-life sign, I was wondering how to make custom text characters like this ----->λ²

Ive tried using character map, but it dosent work D:

[Ad Bot]

[KoopaScooper]

Ive tried using character map, but it dosent work D:

Uhh, Copy/Paste characters?

[Awasp]

that isn't custom text, that text comes with all computers. The chracter map has it and that is also the symbol for the half life of an atom if im correct.

[Exo Pheratype]

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