rassclot said:oh dear. oh dear oh fucking dear. no offence but this is another creeping americanism that really gets on my tits. in british english period means a passage of time or a menstrual cycle. it does not mean full stop. so just say full stop.
If you want to get technical, period is the correct word for it and full stop is a bastardisation.
In fact, if you want to get really technical, then SkyBlueFlux was also incorrect to call them 'commas instead of periods', when he actually means 'commas instead of ellipsis'