e.g. i.e.

i.e. means "that is." from the origin is "id est."

e.g. means "for example." from the origin "exempli gratia."

In American English, generally follow i.e. and e.g. with a comma.

Random: Roman Numerals has no representation for zero, since they could not see the logic in counting things that you do not have. That might be why Arabians (with a Arabian number system that include a representation for zero) are stereotyped as rich and greedy, rather than Romans...

per se: another commonly misspelled Latin phrase used in English arguments for "by itself" or "by themselves".