[zhaphod]

Regarding the correct form of don't panic, I am with you. I have absolutely no clue when it comes to Latin {on the other hand I can talk my way out of any situation in more than a few south Indian languages}. I was fooling around with Google translate and wanted a short form and settled on "ne pavor".

I used the Greek transliteration because I absolutely love how Greek letters look in latex.

Regarding the "h" : When I was choosing the nick name I thought there was an "h" in zaphod and realized the mistake way too late to change it in so many different places.

[thaumasiotes]

To add a little more Latin pedantry, "ne" is a defensible choice for a negative imperative (you'd use it with a subjunctive verb, I believe: "ne pavescas" or "ne pavescatis"), but not the only choice; the standard I learned was noli +inf ("noli pavescere" or "nolite pavescere").

Finally, the vowel of ne is long, and so if you want to write it in greek letters you should use an eta, not an epsilon (then again, you seem to be rendering vulgar latin into modern greek rather than classical latin into classical greek; I'm not even sure how to deal with a classical letter 'v' in greek).