There are multiple definitions:

1. higher order statistics(English)

   • refers to functions that use the third or higher power
   • DFT
   • Statistics
   • http://www1.mat…/hos_intro.html

2. higher order spectrum(English)

   • also known as polyspectrum
   • HRV
   • Signal analysis

3. Holt-Oram Syndrome(English)

   • autosomal dominant syndrome characterized by skeletal abnormalities of the upper extremities, with at least one abnormality affecting the bones of the wrist. Also, 75% of individuals have been shown to have concomitant cardiac conditions. Affected individuals may have abnormal variations of the thumbs ranging from complete absence to elongation, various presentations of the radius bone ranging from partial to complete absence, and abnormalities of the clavicle and scapula are also frequent. Associations between HOS and MRKH have been discussed
   • MRKH
   • Congenital disorders, Musculoskeletal system
   • https://doi.org…13570-9.00006-1

4. Hip Outcome Score(English)

   • ADL, PEDro, VISA-G, FAIS, HOS-ADL, HOS-SS, MCID, mHHS
   • Sports medicine, Scoring systems/scales, Surgery
   • https://doi.org…rts-2021-104548
   • https://doi.org…363546519892905

5. human osteosarcoma(English)

   • ALP, BSP, CB, MAPK
   • Oncology, Skeleton and bone (formation)
   • https://doi.org…155/2013/812718