| Unbound | Singular.Registry.TrieState.Types, Singular.Registry.TrieState |
| unD | Singular.Registry.Wire.Primitive |
| Undecodable | |
| 1 (Data Constructor) | Singular.Provider.Koios.Client |
| 2 (Type/Class) | Singular.Registry.TrieState.Types, Singular.Registry.TrieState |
| UndecodableRequest | Singular.Registry.TrieState.Types, Singular.Registry.TrieState |
| UndecodableStateOutput | Singular.Registry.TrieState.Types, Singular.Registry.TrieState |
| unhideTrie | Singular.Registry.Trie |
| Unknown | Singular.Registry.TrieState.Types, Singular.Registry.TrieState |
| UnknownEpoch | Singular.Provider.Koios.Client |
| UnknownFact | |
| 1 (Type/Class) | Singular.Provider.Koios.Client |
| 2 (Data Constructor) | Singular.Provider.Koios.Client |
| UnknownRegistration | Singular.Provider.Koios.Client |
| UnknownRegistry | Singular.Registry.TrieState.Types, Singular.Registry.TrieState |
| UnknownTip | Singular.Provider.Koios.Client |
| UnknownTransaction | Singular.Provider.Koios.Client |
| unOnChainRoot | Singular.Registry.Wire.Primitive, Singular.Registry.Types |
| unOnChainTokenId | Singular.Registry.Wire.Primitive, Singular.Registry.Types |
| Unreachable | Singular.Provider.Koios.Client |
| UnreadableRecord | Singular.Registry.TrieState.Types, Singular.Registry.TrieState |
| UnreadableRoot | Singular.Registry.TrieState.Types, Singular.Registry.TrieState |
| UnresolvedInput | Singular.Registry.TrieState.Types, Singular.Registry.TrieState |
| Update | Singular.Registry.Wire.Redeemer, Singular.Registry.Types |
| UpdateRedeemer | Singular.Registry.Wire.Redeemer, Singular.Registry.Types |
| updateTokenImpl | Singular.Registry.TxBuilder.Update |
| updateTokenSelected | Singular.Registry.TxBuilder.Update |
| updateTokenWithDuties | Singular.Registry.TxBuilder.Update |
| updateTokenWithTrieState | Singular.Registry.TxBuilder.Update |
| UtxoInfo | |
| 1 (Type/Class) | Singular.Provider.Koios.Wire |
| 2 (Data Constructor) | Singular.Provider.Koios.Wire |
| utxoInfo | Singular.Provider.Koios.Client |
| utxoInfoReference | Singular.Provider.Koios.Wire |
| utxoInfoRequest | Singular.Provider.Koios.Wire |
| utxoInfoSpent | Singular.Provider.Koios.Wire |