Transient is the most hyped, abused and trendy word in GS. A transient is a short-duration signal that represents a nonharmonic attack phase of a sound source. It contains a high degree of nonperiodic components and a higher magnitude of high frequencies than the harmonic content of that sound.
But like any estimate, it's based on some rounded numbers and rules of thumb. For example, this mortgage affordability calculator assumes that your monthly mortgage payment should be no more than 28% of your monthly income, to leave enough money for other expenses and investments you'll want to make.
Loans greater than these limits are called non-conforming or jumbo loans. Most US counties have a maximum mortgage limit of $424,100 for a single family home, ($543,000) for two units, ($656,350) for three units & ($812,650) for four units. These limits are applicable for purchase and refinance mortgages.