Type S, N, H cement/mortar?

Could somebody explain to me what the mortar types are: S, N, H ?? Even google couldn't help me. Thx.
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Em wrote:

http://www.free-ed.net/sweethaven/BldgConst/Masonry/lessonmain.asp?iNum=fra0104
(First entry on a google for "mortar types", btw...)
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