LF n. (Electronics) Low frequency, a term used to refer to radio waves of a frequency from 30 to 300 kilohertz. Contrasted to HF, high frequency. (Acronym)
... goods which you sent us. They are in no respect up to sample which we keep pending a settlement of any differences which we might have in respects to this matter. Yours truly, L. FEINHOLZ. Dic LF to RC ... — Potash & Perlmutter - Their Copartnership Ventures and Adventures • Montague Glass