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  The hash subkey.
NIST SP 800-38D

  In LMS and XMSS, the height of the tree. In XMSSMT, the total height of the multi-tree (the trees at each level have a height of H/D).
NIST SP 800-208

  An auxiliary function used in certain key derivation methods. H is either an approved hash function, hash, or an HMAC-hash based on an approved hash function, hash, with a salt value used as the HMAC key.
NIST SP 800-56A Rev. 2 [Superseded]
NIST SP 800-56B Rev. 1 [Superseded]