(a) As used in these Rules "P.E.F. Code" shall mean a reference to the Probate, Estates and Fiduciary Code, June 30, 1972, P. L. 508, 20 Pa.C.S.A Sec. 101, et seq., as amended. (b) As used in these Rules, the terms "Citation" and "Rule to Show Cause" shall be interchangeable unless otherwise specially ordered by the Court, all interest earned on said accounts shall accrue to the credit of the County of Carbon.