### Symbol for flux

1 Translingual. Symbol ; See also. 2 Greek. Letter; Numeral; See also {\displaystyle H(t)\left|\psi \left(t. (electrical engineering) Electric flux. ‎ Translingual · ‎ Symbol · ‎ Greek. The symbol you linked denotes the integral around any closed path (a loop or a surface). Flux is typically denoted by the greek letter phi. Symbol: E0 Unit: watt per square metre, W/m2 Relation: E0 - s L dco Jin Spherical irradiance. Limit of the ratio of radiant flux onto a spherical surface to the area.