In my siddur -- Siddur Tefillah Hashalem (Greenwald), page 162 has a text for separating terumah and ma'aser. In the instructions, if my understanding is correct, the text seems to require using a shilling (this is a photo https://www.snapfish.com/photo-gift/share?via=link&token=UI6iuTQ68NN4QQxjNVJUgg/SFO/27947492559060/SNAPFISH ; I hope it works).
Why would the ritual require (or prefer) using a shilling and what sort of shilling is it speaking of? Is this a generic term for some sort of coin or is it a reference to a particular item?