Resh = 200, ordinal 20, reduced 2, no final form. Spelled in full, ריש = 200+10+300 = 510, or רש = 500.
Meaning
Resh is 'head', one of the seven doubles (r/rh), and the letter of beginning — reshit — and of the head that the tradition's anatomy makes the seat of the soul. Its 200 is the second of the hundreds, and resh is the initial of both rosh and reshit, which the handlists treat as the letter's whole doctrine.