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Vrom is actually an abbreviation or an acronym which stands for ‘Very Rough Order of Magnitude’. Now, the meaning of very rough order of magnitude is the rough estimation of any project’s level of cost and efforts. This is done in the initial phases which are approval and the selection stage of any project. So the main reason behind using Vrom is that it helps to get an idea of a project's budget and there is a formula for it which is used to find out all the details.