It is always written before the last letter of the non-inflected form of a word or numeral.
It is used in the following ways: Gershayim is a disjunctive cantillation accent in the Tanakh (Jewish bible) - ◌֞.
[1] Most keyboards do not have a key for the gershayim punctuation; as a result, a quotation mark is often substituted for it.
The cantillation accent however is generally not typed, as it plays a completely different role and can occur in the middle of words (it does not mark any word separation), or marked using a different interlinear notation if needed (such as superscripts or other notational symbols).
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