Double

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A double is a headmate that shares an identity with another headmate. Usually, this occurs in two ways:
 * 1) A headmate shares an identity with another system member (like two fictives of the same character, even if one is nonsimilous);
 * 2) A headmate based mostly/completely off of an existing system member (like a snapshots).

Related Terms
A snapshot is a kind of double, as is a pseudo-original.