There are many abbreviations of Latin words in English, but most of the words behind those abbreviations are not used in English in their full form.

The following are some Latin abbreviations used in English:

a.m.ante meridiembefore noon
cf.confer(bring together) compare
c.p.caeteris paribusother things being equal
e.g.exempli gratiafor example
et alia, et aliae, et aliiand others caeteraand so on
f., ff.folium, foliapage(s)
i.a.inter aliaamong other things
ibid.ibidemin the same place estthat is
lb.librapound (weight)
nem.con.nemine contradicenteno one dissenting
op.cit.opera citatothe work cited
p.a.per annumper year meridiemafter noon
p.p.per procurationemthrough the agency of
q.v.quod videtwhich see
rein rein the matter of
sicsic erat scriptumthus it was written
vs. (in legal text v.)versusagainst
viz.videlicetnamely, that is to say

You can use sic to indicate a mistake in a cited text to show that the mistake was in the original text and is not yours. It is usually put inside square brackets: [sic]

The following are capitalised:

ADanno Dominiin the year of the Lord
C.V.curriculum vitaecourse of life
M.O.modus operandimethod of operating
N.B.nota benenote well scriptumafter what has been written

Even if Latin words often are italicised in English text, you should write their abbreviations in normal font.

Read more about e.g. and i.e. and about et al.

No, no, these are not Latin abbreviations!