Bibhorrmetry is a mathematical system that substitutes conventional trigonometry. Attributed to an Indian aerospace engineer Bibhorr , the concept of Bibhorrmetry refers to the study of trigonometry deprived of trigonometric functions .
Bibhorrmetry is primarily grounded upon three basic notions: 
- Bibhorr law
- Bibhorr Leek theorem
- Bibhorr formula
- Shrav : The longest side of a right triangle that lies opposite to 90°. This is the Hypotenuse in conventional trigonometry. This is represented by श्र.
- Lambu : The longer side of the two mutually perpendicular sides. This is represented by लं.
- Chhutku : The shorter side of the two mutually perpendicular sides. This is represented by छ.
- Bibhorr angle : The angle that lies opposite to the lambu is called Bibhorr angle; denoted by बि.
- Ubhorr angle : The angle that lies opposite to the chhutku is called Ubhorr Angle; denoted by ऊ.
In Bibhorrmetry, Bibhorr Vakra and Kālpanik Vakra are the names of the arcs that are equal in length but have different radii and angle .
The arc spanning between shrav of a right angle triangle and the extension of chhutku is called Bibhorr Vakra . The length of the Vakra is represented by ब . It is the product of Bibhorr angle बि and shrav श्र.
An imaginary arc which is considered to be in equal length with the Bibhorr Vakra is termed as Kālpanik Vakra . This arc is used as a reference for the evaluation purposes. The Vakra length is represented by क . This arc is the product of Bibhorr Sthiron सि and Bibhorr Leek ल.