- The lower-case letter ρ is used as the symbol for the Density of a material in physics.
- The lower-case letter ρ is used as the symbol for the Resistivity of a material in physics.
- The lower-case letter ρ is the name of the three varieties of Rho Meson ().
- The lower-case letter ρ is used as the symbol for the Rho Factor protein in RNA transcription termination.
- A small GTPase , which is important in migration and stress fibre formation
- A Large format Industrial Ink-Jet printer from Durst AG, the Durst Rho. (See alsa the Durst Lambda)
- The rate at which the price of a derivative changes relative to a change in the risk-free rate of interest. Rho measues the sensitivity of an option or options portfolio to a change in interest rate.
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