Where it's not obvious:
BE = British English, AE=American English and indicates
an external link
Xerox company owns the trademark, but (like Hoover) the word
is now in the language as a verb. To xerox something is simply
to photocopy it, whether or not a Xerox machine is involved
not strictly AE, but included because it is often misunderstood
and many religious Americans actually decry its use because of its
apparent secularisation of the Christian festival. In fact the "X"
is a very long-standing (nearly as old as Christianity itself) abbreviation
for Christ, and it arises from the Greek Chi, which is the
first letter of "Christ". It is definitely not a cross symbolising
Christ, nor was it invented to denegrate Christ.