Put forward the character

some time before the friend The-Ridho membrendel
shoutbox I with one question that his contents
same, whether intended spam or not deliberate
terposting.
Must him was not like this, his ethics of one
question have been enough.
That wanted just advertised also was permitted
by me to be natural, lest the article that was
same in input repeatedly so as to disrupt
scenery as well as to obstruct the person's
other opportunity to comment.
Okay, came back to the friend's question
The-Ridho.
His question quotation like this:
To contain one equation the editor
(the symbol of mathematics) not only in Ms word 

or in software other, in blog also could in did,
but needed the special trick that is us must
replace equation this editor or for instance
as the special character with his replacement
notation or also more good-looking him still
was named his entity (said the person IT like
that).
For example to write a symbol sigma (Σ) the
friend must replace with his entity that is
Σ with the note at the time of posting the
article must in the position edited HTML not
in the Compose position.
Indeed, for several characters, the friend 

could mengcopy direct from Ms word and in
paste in the column posting, but plenty of
characters that could not in translated by
browser so as will produce tampilan the
character that not in wanted, because of
that the friend must replace these characters
with his entity.
Supervised this I wrote several characters
togethered with his entity that was known by me:
As in the case of hurup normally generally,
this special character could the friend varied,
the example in for thick, askew, was underlined, in the scratch or that was other.
The example:
To make thick, the friend was enough to add this order:
< b > Σ < /b >