Fir can refer to two different things: a type of tree and a legal document.
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Tree: Firs are evergreen coniferous trees belonging to the genus Abies in the family Pinaceae. There are approximately 48-56 extant species, found on mountains throughout much of North and Central America, Europe, Asia, and North Africa. They are large trees, reaching heights of 10-80 meters tall with trunk diameters of 0.5-4 meters when mature. Firs can be distinguished from other members of the pine family by their needle-like leaves that grow directly from the branch and leave conspicuous circular scars when the leaves fall. Each cone is borne in an upright position, and its spikelike axis remains on the branch after the mature cone falls apart.
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Legal document: A First Information Report (FIR) is a written document prepared by the police when they receive information about the commission of a cognizable offence. It is a document prepared by police organizations in Indian subcontinent and Southeast Asian countries including Myanmar, India, Bangladesh, and Pakistan when they receive information about the commission of a cognizable offence, or in Singapore when the police receive information about any criminal offence. It generally stems from a complaint lodged with the police by the victim of a cognizable offence or by someone on their behalf, but anyone can make such a report either orally or in writing to the police. Cognizable offences are serious criminal offences that pose an immediate danger to society such as murder, rape, or robbery. For a non-cognizable offence, an entry in a community service register or in the station diary is made.