welcome arch; ceremonial gateway
A formal arch or gateway erected to welcome an important person, such as a dignitary or member of the imperial family. Often temporary and decorative.
A welcome arch was set up in front of the station to greet the state guest.
Compound of 奉迎 (ほうげい, 'welcome, especially of a noble or imperial person') and 門 (もん, 'gate'). The exact historical derivation is uncertain, but the term is associated with formal state ceremonies.