From Wikipedia
Angels & Demons is a bestselling mystery novel by Dan Brown. Published in 2000, it introduces the character Robert Langdon, who is also the principal character of Brown’s subsequent, better-known novel The Da Vinci Code.
An ambigram, also sometimes known as an inversion or flipscript, is a graphical figure that spells out a word not only in its form as presented, but also in another direction or orientation.
This book is my inspiration for making ambigrams, like any other person who have read it. But my ambirams are still far from perfection when you compare it to John Langdon’s (the one who did the ambigrams in Dan Brown’s book)
Here they are… take a look
fer
fermie
I used to do this even before that Dan Brown thing.