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Fire Alarm and Detection systems are categorised in the following way: 

P = AFD* designed to primarily protect Property 
P1 = AFD installed throughout all areas 
P2 = AFD installed only in defined areas
L = AFD designed to primarily protect Human Life 
L1 = AFD installed throughout all areas 
L2 = AFD installed in defined areas in addition to L3 
L3 = AFD installed in escape routes and rooms opening onto those routes 
L4 = AFD installed in escape routes comprising circulation areas and spaces such as corridors and stairways 
L5 = A non-prescriptive system in which the protected area(s) is designed to satisfy a specific fire risk objective (other than that of L1 to L4)
M = System designed to be operated manually (no AFD) *AFD = Automatic Fire Detection

Hochiki's Guide to BS5839:

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