Full stops evolved from Aristophanes' periodos, the dot used to mark the large breath necessary for reading a long passage. Full stops have been called by several names throughout history—Chaucer called them points, while the Bard himself called them periods in A Midsummer Night's Dream.

Clearly not noone; but there is a global movement in English away from using periods in abbreviations and acronyms—hence RIP rather than R.I.P.

*Note that other units of measurement, such as 18 km, 20 ft, and 5 m, do not require periods after the abbreviated unit unless they fall at the end of a sentence.