 The Hebrew numeral system has sometimes been extended to include the five final letter forms— for 500, for 600, for 700, for 800, for 900—which are then used to indicate the numbers from 500 to 900.The ordinary additive forms for 500 to 900 are , , , and .Gershayim (U+05F4 in Unicode, and resembling a double quote mark) (sometimes erroneously referred to as "merkha'ot", which is Hebrew for double quote) are inserted before (to the right of) the last (leftmost) letter to indicate that the sequence of letters represents a number rather than a word.