hbomb (hydrogen bomb)
Heather Wallis goes by Hbomb.
H Haden Hammond goes by HBomb.
A hydrogen bomb is, by far, the most destructive weapon that mankind has ever invented. It is the most powerful type of nuclear bomb.
The correct word is e-mail. The word is a contraction of "electronic mail" and just as "hydrogen bomb" reduces to H-bomb not Hbomb, so electronic mail reduces to e-mail, not email. Other examples are:e-learninge-commercee-business