- Besselian day number
- Besselian day numbers
- Besselian elements
- Besselian epoch
- Besselian solar year
- Besselian star constant
- Besselian star number
- Besselian year
- Bessel identity
- Bessel inequality
- Bessel integral
- Bessel interpolation formula
- BesselJ
- BesselJZero
- BesselK
- Bessel kernel
- Bessel polynomial
- Bessel potential
- Bessel potential operator
- Bessel potential space
- Bessel process
- Bessel second integral
- Bessel statistical formula
- Bessel system of functions
- Bessel transform