Roman numerals Arabic numerals Roman numerals Arabic numerals

Ⅰ 1 ⅩⅣ 14

Ⅱ 2 ⅩⅤ 15

Ⅲ 3 ⅩⅥ 16

Ⅳ 4 ⅩⅦ 17

Ⅴ 5 ⅩⅧ 18

Ⅵ 6 ⅩⅨ 29

Ⅶ 7 ⅩⅩ 20

ⅷ8 L 50

ⅸ9 C 100

ⅹ 10 CL 150

? 1 1 cc 200

12 copper clad laminate 250

ⅹⅲ 13 CCC 300

Greek alphabet

Pronunciation meaning of uppercase and lowercase English

α α α angle; coefficient

β β β magnetic flux coefficient; Angle; coefficient

γ γ γ conduction coefficient (lowercase)

Delta delta variation; Density; diopter

The cardinal number of ε ε ε ε, ε logarithm

Zeta coefficient; Azimuth; Impedance; Relative viscosity; atomic number

η η η lag coefficient; Efficiency (lowercase)

θ θ, θ θ temperature; phase angle

A little bit, a little bit

κ κ κ κ κ dielectric constant

∧ λ λ wavelength (lowercase); roll

μ μ μ permeability coefficient; Micro (one thousandth); Magnification factor (lowercase)

ν ν nu magnetoresistive coefficient

ξξXi

Omikron

∏ π circumference ÷ diameter =3. 14 16

ρ ρ, ρ ρ resistance coefficient (lowercase)

∑σ, sum of sσ (in words), area density; Transconductance (lowercase)

τ τ time constant

υ displacement

φ φ φ φ magnetic flux; corner

χχch I

ψ ψ psi angular velocity; Dielectric flux (static power line); corner

Ω Ω Ω Ohm (in words); Angular velocity (lowercase); corner