The number and type of particles it emits gives rise to the type of radiation being emitted. In the case of alpha decay, a helium nucleus (two protons, and two neutrons) are emitted. This is the lowest energy radiation type, but it is none the less dangerous to human health.
This abbreviation is usually found on maps, on expense reports, and it is very common to see miles abbreviated to mi. just about any time they are referenced. You might abbreviate the word miles to mi. on a road sign or a map with directions to a destination. It is also common to see such abbreviations in headlines or newspaper titles where space is a concern. Outside of maps, business mileage reports, etc. the word is not abbreviated in general prose.
k (pronounced /keÉª/) is occasionally used in some English-speaking countries as an alternative for the word kilometre in colloquial writing and speech. A slang term for the kilometre in the US military is klick.he Dutch, on the other hand, adopted the kilometre in 1817 but gave it the local name of the mijl. It was only in 1867 that the term  kilometer  became the only official unit of measure in the Netherlands to represent 7003100000000000000â 1000 metres.