Data synchronization via any protocol can be unidirectional or bidirectional. Transcytosis may be either unidirectional or bidirectional. A transient-voltage-suppression diode may be either unidirectional or bidirectional. Universals may also be bidirectional or unidirectional. It is based on the difference between unidirectional and bidirectional synchronization of neural networks. Both unidirectional and bidirectional use were envisioned. Windcatchers come in various designs&colon; unidirectional, bidirectional, and multidirectional. There are two kinds of dimensions, spatial (bidirectional) and temporal (unidirectional). Shotgun microphones are the most highly directional of simple first-order unidirectional types. Itai and Rodeh introduced an algorithm for a unidirectional ring with synchronized processes. Replication follows the unidirectional strand displacement mechanism discussed above. Identifiers may be classified as "omnidirectional" and "unidirectional". This applies to any unidirectional beam incident to a rotating sphere. Brushed or dull polished metal is metal with a unidirectional satin finish. Ice templating allows the creation of macroscopic pores in a unidirectional arrangement.