| 100% | ABO | 3 | ___ system, used in blood group nomenclature |
| 61% | RHESUS | 6 | Blood group system first observed in monkeys |
| 52% | ABO | 3 | System used in hematology |
| 52% | BASETWO | 7 | System used in computer code |
| 52% | FENGSHUI | 8 | System used in home decor |
| 52% | SONAR | 5 | System used in seafloor mapping |
| 50% | ELO | 3 | Rating system used in chess |
| 50% | ABO | 3 | Blood group system |
| 50% | ABO | 3 | Blood grouping system |
| 49% | ABO | 3 | Classification system used in some banks |
| 48% | LANGUAGE | 8 | Communication system used in a particular country |
| 48% | IPA | 3 | Symbolic system used in dictionaries, for short |
| 48% | GPS | 3 | Navigation system used in Google Maps: Abbr. |
| 47% | ASL | 3 | Communication system used in the film "CODA" (Abbr.) |
| 47% | SIGN | 4 | ___ language (communication system used in the film "CODA") |
| 46% | ROTATION | 8 | System used for the plantation in Middle Ages |
| 45% | IRIS | 4 | Body part used in some recognition systems |
| 45% | PING | 4 | Sound pulse used in active sonar systems |
| 44% | TIEROD | 6 | Bar used in a car's steering system |
| 44% | MONEY | 5 | What's not used in a barter system |
| 44% | NICAM | 5 | Digital system used in British television for the reception of stereo sound signals |
| 44% | SRS | 3 | S.A.T. takers, for short. Also a system used in airbags : Abbr |
| 43% | HIBISCUS | 8 | Large flowers used in tea for high blood pressure |
| 43% | HIEROGLYPH | 10 | Character used in Ancient Egypt's pictorial writing system |
| 42% | INCH | 4 | Small unit of length not used in the metric system |
| 42% | NASA | 4 | Group that uses Cape Canaveral in Florida: Abbr. |
| 42% | JEDI | 4 | Group that uses the Force, in "Star Wars" |
| 41% | TBAR | 4 | Kind of support used in cable car systems at ski destinations : Hyph. |
| 40% | WOOFER | 6 | Loudspeaker used in hi-fi systems for the reproduction of low audio frequencies |
| 38% | BEET | 4 | Its juice is used to mimic blood in a Beyond Burger |