| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 17118-17118 | 子類 Sign and ContentBearingObject |
| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 17119-17119 | 子類 Sign and 顯示神器 |
| No TPTP formula. May not be expressible in strict first order. | Media.kif 851-851 | 子類 Sign and DataDisplayDevice |
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