dMerits : User A sends sMerits to user B  (Not merits) to distribute those merits to other users and number of merit of the user B does not increase.

CMerits: CMerits will be awarded to members who contribute to the forum. as C stands for contributing. Usually merits are sent to a post which is stand out between other posts, but in here the merit sender does not look for an outstanding post but a valuable member who really tries to help others and as previously said contributing to the forum.

aMerits: Archived merits are sent to the posts which are valuable and constructive but have gone unnoticed under the pile of shitty spam posts.

Note: Both CMerits and aMerits are sMerits, only difference is the criteria considered by the merit sender.

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PS:
Hey Jetcash, I wanna know whether the idea of dMerits has been approved by Theymos or not? What is the progress of that idea as I believe it is a good move towards a better merit distribution! (Specially for small local boards where there are no merit sources!)