| 100% | ABO | 3 | System used in hematology |
| 68% | BASETWO | 7 | System used in computer code |
| 68% | FENGSHUI | 8 | System used in home decor |
| 68% | SONAR | 5 | System used in seafloor mapping |
| 66% | ELO | 3 | Rating system used in chess |
| 65% | ABO | 3 | Classification system used in some banks |
| 64% | LANGUAGE | 8 | Communication system used in a particular country |
| 64% | IPA | 3 | Symbolic system used in dictionaries, for short |
| 64% | GPS | 3 | Navigation system used in Google Maps: Abbr. |
| 63% | ASL | 3 | Communication system used in the film "CODA" (Abbr.) |
| 63% | SIGN | 4 | ___ language (communication system used in the film "CODA") |
| 60% | ROTATION | 8 | System used for the plantation in Middle Ages |
| 59% | IRIS | 4 | Body part used in some recognition systems |
| 59% | PING | 4 | Sound pulse used in active sonar systems |
| 58% | TIEROD | 6 | Bar used in a car's steering system |
| 58% | MONEY | 5 | What's not used in a barter system |
| 58% | NICAM | 5 | Digital system used in British television for the reception of stereo sound signals |
| 58% | SRS | 3 | S.A.T. takers, for short. Also a system used in airbags : Abbr |
| 57% | HIEROGLYPH | 10 | Character used in Ancient Egypt's pictorial writing system |
| 57% | ABO | 3 | ___ system, used in blood group nomenclature |
| 56% | INCH | 4 | Small unit of length not used in the metric system |
| 54% | TBAR | 4 | Kind of support used in cable car systems at ski destinations : Hyph. |
| 53% | WOOFER | 6 | Loudspeaker used in hi-fi systems for the reproduction of low audio frequencies |
| 50% | VAS | 3 | Units used for expressing electrical power in the metric system (abbr.) |
| 48% | CURRENCY | 8 | System of money in use in a specific country |
| 47% | DEVOTIONAL | 10 | Used in worship |
| 47% | SHUTTLECOCK | 11 | Used in badminton |
| 47% | INK | 3 | Used in printer |
| 47% | LEAD | 4 | Used in batteries |
| 47% | GUN | 3 | Used in shooting |